diff --git a/client/auxiliary.go b/client/auxiliary.go
new file mode 100644
index 000000000..59b3f5238
--- /dev/null
+++ b/client/auxiliary.go
@@ -0,0 +1,586 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Code generated by protoc-gen-go_gapic. DO NOT EDIT.
+
+package client
+
+import (
+	"context"
+	"time"
+
+	"cloud.google.com/go/longrunning"
+	longrunningpb "cloud.google.com/go/longrunning/autogen/longrunningpb"
+	genprotopb "github.com/googleapis/gapic-showcase/server/genproto"
+	gax "github.com/googleapis/gax-go/v2"
+	"google.golang.org/api/iterator"
+	locationpb "google.golang.org/genproto/googleapis/cloud/location"
+)
+
+// SearchBlurbsOperation manages a long-running operation from SearchBlurbs.
+type SearchBlurbsOperation struct {
+	lro      *longrunning.Operation
+	pollPath string
+}
+
+// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
+//
+// See documentation of Poll for error-handling information.
+func (op *SearchBlurbsOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*genprotopb.SearchBlurbsResponse, error) {
+	opts = append([]gax.CallOption{gax.WithPath(op.pollPath)}, opts...)
+	var resp genprotopb.SearchBlurbsResponse
+	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
+		return nil, err
+	}
+	return &resp, nil
+}
+
+// Poll fetches the latest state of the long-running operation.
+//
+// Poll also fetches the latest metadata, which can be retrieved by Metadata.
+//
+// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
+// the operation has completed with failure, the error is returned and op.Done will return true.
+// If Poll succeeds and the operation has completed successfully,
+// op.Done will return true, and the response of the operation is returned.
+// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
+func (op *SearchBlurbsOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*genprotopb.SearchBlurbsResponse, error) {
+	opts = append([]gax.CallOption{gax.WithPath(op.pollPath)}, opts...)
+	var resp genprotopb.SearchBlurbsResponse
+	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
+		return nil, err
+	}
+	if !op.Done() {
+		return nil, nil
+	}
+	return &resp, nil
+}
+
+// Metadata returns metadata associated with the long-running operation.
+// Metadata itself does not contact the server, but Poll does.
+// To get the latest metadata, call this method after a successful call to Poll.
+// If the metadata is not available, the returned metadata and error are both nil.
+func (op *SearchBlurbsOperation) Metadata() (*genprotopb.SearchBlurbsMetadata, error) {
+	var meta genprotopb.SearchBlurbsMetadata
+	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
+		return nil, nil
+	} else if err != nil {
+		return nil, err
+	}
+	return &meta, nil
+}
+
+// Done reports whether the long-running operation has completed.
+func (op *SearchBlurbsOperation) Done() bool {
+	return op.lro.Done()
+}
+
+// Name returns the name of the long-running operation.
+// The name is assigned by the server and is unique within the service from which the operation is created.
+func (op *SearchBlurbsOperation) Name() string {
+	return op.lro.Name()
+}
+
+// WaitOperation manages a long-running operation from Wait.
+type WaitOperation struct {
+	lro      *longrunning.Operation
+	pollPath string
+}
+
+// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
+//
+// See documentation of Poll for error-handling information.
+func (op *WaitOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*genprotopb.WaitResponse, error) {
+	opts = append([]gax.CallOption{gax.WithPath(op.pollPath)}, opts...)
+	var resp genprotopb.WaitResponse
+	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
+		return nil, err
+	}
+	return &resp, nil
+}
+
+// Poll fetches the latest state of the long-running operation.
+//
+// Poll also fetches the latest metadata, which can be retrieved by Metadata.
+//
+// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
+// the operation has completed with failure, the error is returned and op.Done will return true.
+// If Poll succeeds and the operation has completed successfully,
+// op.Done will return true, and the response of the operation is returned.
+// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
+func (op *WaitOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*genprotopb.WaitResponse, error) {
+	opts = append([]gax.CallOption{gax.WithPath(op.pollPath)}, opts...)
+	var resp genprotopb.WaitResponse
+	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
+		return nil, err
+	}
+	if !op.Done() {
+		return nil, nil
+	}
+	return &resp, nil
+}
+
+// Metadata returns metadata associated with the long-running operation.
+// Metadata itself does not contact the server, but Poll does.
+// To get the latest metadata, call this method after a successful call to Poll.
+// If the metadata is not available, the returned metadata and error are both nil.
+func (op *WaitOperation) Metadata() (*genprotopb.WaitMetadata, error) {
+	var meta genprotopb.WaitMetadata
+	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
+		return nil, nil
+	} else if err != nil {
+		return nil, err
+	}
+	return &meta, nil
+}
+
+// Done reports whether the long-running operation has completed.
+func (op *WaitOperation) Done() bool {
+	return op.lro.Done()
+}
+
+// Name returns the name of the long-running operation.
+// The name is assigned by the server and is unique within the service from which the operation is created.
+func (op *WaitOperation) Name() string {
+	return op.lro.Name()
+}
+
+// BlurbIterator manages a stream of *genprotopb.Blurb.
+type BlurbIterator struct {
+	items    []*genprotopb.Blurb
+	pageInfo *iterator.PageInfo
+	nextFunc func() error
+
+	// Response is the raw response for the current page.
+	// It must be cast to the RPC response type.
+	// Calling Next() or InternalFetch() updates this value.
+	Response interface{}
+
+	// InternalFetch is for use by the Google Cloud Libraries only.
+	// It is not part of the stable interface of this package.
+	//
+	// InternalFetch returns results from a single call to the underlying RPC.
+	// The number of results is no greater than pageSize.
+	// If there are no more results, nextPageToken is empty and err is nil.
+	InternalFetch func(pageSize int, pageToken string) (results []*genprotopb.Blurb, nextPageToken string, err error)
+}
+
+// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
+func (it *BlurbIterator) PageInfo() *iterator.PageInfo {
+	return it.pageInfo
+}
+
+// Next returns the next result. Its second return value is iterator.Done if there are no more
+// results. Once Next returns Done, all subsequent calls will return Done.
+func (it *BlurbIterator) Next() (*genprotopb.Blurb, error) {
+	var item *genprotopb.Blurb
+	if err := it.nextFunc(); err != nil {
+		return item, err
+	}
+	item = it.items[0]
+	it.items = it.items[1:]
+	return item, nil
+}
+
+func (it *BlurbIterator) bufLen() int {
+	return len(it.items)
+}
+
+func (it *BlurbIterator) takeBuf() interface{} {
+	b := it.items
+	it.items = nil
+	return b
+}
+
+// EchoResponseIterator manages a stream of *genprotopb.EchoResponse.
+type EchoResponseIterator struct {
+	items    []*genprotopb.EchoResponse
+	pageInfo *iterator.PageInfo
+	nextFunc func() error
+
+	// Response is the raw response for the current page.
+	// It must be cast to the RPC response type.
+	// Calling Next() or InternalFetch() updates this value.
+	Response interface{}
+
+	// InternalFetch is for use by the Google Cloud Libraries only.
+	// It is not part of the stable interface of this package.
+	//
+	// InternalFetch returns results from a single call to the underlying RPC.
+	// The number of results is no greater than pageSize.
+	// If there are no more results, nextPageToken is empty and err is nil.
+	InternalFetch func(pageSize int, pageToken string) (results []*genprotopb.EchoResponse, nextPageToken string, err error)
+}
+
+// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
+func (it *EchoResponseIterator) PageInfo() *iterator.PageInfo {
+	return it.pageInfo
+}
+
+// Next returns the next result. Its second return value is iterator.Done if there are no more
+// results. Once Next returns Done, all subsequent calls will return Done.
+func (it *EchoResponseIterator) Next() (*genprotopb.EchoResponse, error) {
+	var item *genprotopb.EchoResponse
+	if err := it.nextFunc(); err != nil {
+		return item, err
+	}
+	item = it.items[0]
+	it.items = it.items[1:]
+	return item, nil
+}
+
+func (it *EchoResponseIterator) bufLen() int {
+	return len(it.items)
+}
+
+func (it *EchoResponseIterator) takeBuf() interface{} {
+	b := it.items
+	it.items = nil
+	return b
+}
+
+// LocationIterator manages a stream of *locationpb.Location.
+type LocationIterator struct {
+	items    []*locationpb.Location
+	pageInfo *iterator.PageInfo
+	nextFunc func() error
+
+	// Response is the raw response for the current page.
+	// It must be cast to the RPC response type.
+	// Calling Next() or InternalFetch() updates this value.
+	Response interface{}
+
+	// InternalFetch is for use by the Google Cloud Libraries only.
+	// It is not part of the stable interface of this package.
+	//
+	// InternalFetch returns results from a single call to the underlying RPC.
+	// The number of results is no greater than pageSize.
+	// If there are no more results, nextPageToken is empty and err is nil.
+	InternalFetch func(pageSize int, pageToken string) (results []*locationpb.Location, nextPageToken string, err error)
+}
+
+// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
+func (it *LocationIterator) PageInfo() *iterator.PageInfo {
+	return it.pageInfo
+}
+
+// Next returns the next result. Its second return value is iterator.Done if there are no more
+// results. Once Next returns Done, all subsequent calls will return Done.
+func (it *LocationIterator) Next() (*locationpb.Location, error) {
+	var item *locationpb.Location
+	if err := it.nextFunc(); err != nil {
+		return item, err
+	}
+	item = it.items[0]
+	it.items = it.items[1:]
+	return item, nil
+}
+
+func (it *LocationIterator) bufLen() int {
+	return len(it.items)
+}
+
+func (it *LocationIterator) takeBuf() interface{} {
+	b := it.items
+	it.items = nil
+	return b
+}
+
+// OperationIterator manages a stream of *longrunningpb.Operation.
+type OperationIterator struct {
+	items    []*longrunningpb.Operation
+	pageInfo *iterator.PageInfo
+	nextFunc func() error
+
+	// Response is the raw response for the current page.
+	// It must be cast to the RPC response type.
+	// Calling Next() or InternalFetch() updates this value.
+	Response interface{}
+
+	// InternalFetch is for use by the Google Cloud Libraries only.
+	// It is not part of the stable interface of this package.
+	//
+	// InternalFetch returns results from a single call to the underlying RPC.
+	// The number of results is no greater than pageSize.
+	// If there are no more results, nextPageToken is empty and err is nil.
+	InternalFetch func(pageSize int, pageToken string) (results []*longrunningpb.Operation, nextPageToken string, err error)
+}
+
+// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
+func (it *OperationIterator) PageInfo() *iterator.PageInfo {
+	return it.pageInfo
+}
+
+// Next returns the next result. Its second return value is iterator.Done if there are no more
+// results. Once Next returns Done, all subsequent calls will return Done.
+func (it *OperationIterator) Next() (*longrunningpb.Operation, error) {
+	var item *longrunningpb.Operation
+	if err := it.nextFunc(); err != nil {
+		return item, err
+	}
+	item = it.items[0]
+	it.items = it.items[1:]
+	return item, nil
+}
+
+func (it *OperationIterator) bufLen() int {
+	return len(it.items)
+}
+
+func (it *OperationIterator) takeBuf() interface{} {
+	b := it.items
+	it.items = nil
+	return b
+}
+
+// PagedExpandResponseListPair is a holder type for string/*genprotopb.PagedExpandResponseList map entries
+type PagedExpandResponseListPair struct {
+	Key   string
+	Value *genprotopb.PagedExpandResponseList
+}
+
+// PagedExpandResponseListPairIterator manages a stream of PagedExpandResponseListPair.
+type PagedExpandResponseListPairIterator struct {
+	items    []PagedExpandResponseListPair
+	pageInfo *iterator.PageInfo
+	nextFunc func() error
+
+	// Response is the raw response for the current page.
+	// It must be cast to the RPC response type.
+	// Calling Next() or InternalFetch() updates this value.
+	Response interface{}
+
+	// InternalFetch is for use by the Google Cloud Libraries only.
+	// It is not part of the stable interface of this package.
+	//
+	// InternalFetch returns results from a single call to the underlying RPC.
+	// The number of results is no greater than pageSize.
+	// If there are no more results, nextPageToken is empty and err is nil.
+	InternalFetch func(pageSize int, pageToken string) (results []PagedExpandResponseListPair, nextPageToken string, err error)
+}
+
+// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
+func (it *PagedExpandResponseListPairIterator) PageInfo() *iterator.PageInfo {
+	return it.pageInfo
+}
+
+// Next returns the next result. Its second return value is iterator.Done if there are no more
+// results. Once Next returns Done, all subsequent calls will return Done.
+func (it *PagedExpandResponseListPairIterator) Next() (PagedExpandResponseListPair, error) {
+	var item PagedExpandResponseListPair
+	if err := it.nextFunc(); err != nil {
+		return item, err
+	}
+	item = it.items[0]
+	it.items = it.items[1:]
+	return item, nil
+}
+
+func (it *PagedExpandResponseListPairIterator) bufLen() int {
+	return len(it.items)
+}
+
+func (it *PagedExpandResponseListPairIterator) takeBuf() interface{} {
+	b := it.items
+	it.items = nil
+	return b
+}
+
+// RoomIterator manages a stream of *genprotopb.Room.
+type RoomIterator struct {
+	items    []*genprotopb.Room
+	pageInfo *iterator.PageInfo
+	nextFunc func() error
+
+	// Response is the raw response for the current page.
+	// It must be cast to the RPC response type.
+	// Calling Next() or InternalFetch() updates this value.
+	Response interface{}
+
+	// InternalFetch is for use by the Google Cloud Libraries only.
+	// It is not part of the stable interface of this package.
+	//
+	// InternalFetch returns results from a single call to the underlying RPC.
+	// The number of results is no greater than pageSize.
+	// If there are no more results, nextPageToken is empty and err is nil.
+	InternalFetch func(pageSize int, pageToken string) (results []*genprotopb.Room, nextPageToken string, err error)
+}
+
+// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
+func (it *RoomIterator) PageInfo() *iterator.PageInfo {
+	return it.pageInfo
+}
+
+// Next returns the next result. Its second return value is iterator.Done if there are no more
+// results. Once Next returns Done, all subsequent calls will return Done.
+func (it *RoomIterator) Next() (*genprotopb.Room, error) {
+	var item *genprotopb.Room
+	if err := it.nextFunc(); err != nil {
+		return item, err
+	}
+	item = it.items[0]
+	it.items = it.items[1:]
+	return item, nil
+}
+
+func (it *RoomIterator) bufLen() int {
+	return len(it.items)
+}
+
+func (it *RoomIterator) takeBuf() interface{} {
+	b := it.items
+	it.items = nil
+	return b
+}
+
+// SessionIterator manages a stream of *genprotopb.Session.
+type SessionIterator struct {
+	items    []*genprotopb.Session
+	pageInfo *iterator.PageInfo
+	nextFunc func() error
+
+	// Response is the raw response for the current page.
+	// It must be cast to the RPC response type.
+	// Calling Next() or InternalFetch() updates this value.
+	Response interface{}
+
+	// InternalFetch is for use by the Google Cloud Libraries only.
+	// It is not part of the stable interface of this package.
+	//
+	// InternalFetch returns results from a single call to the underlying RPC.
+	// The number of results is no greater than pageSize.
+	// If there are no more results, nextPageToken is empty and err is nil.
+	InternalFetch func(pageSize int, pageToken string) (results []*genprotopb.Session, nextPageToken string, err error)
+}
+
+// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
+func (it *SessionIterator) PageInfo() *iterator.PageInfo {
+	return it.pageInfo
+}
+
+// Next returns the next result. Its second return value is iterator.Done if there are no more
+// results. Once Next returns Done, all subsequent calls will return Done.
+func (it *SessionIterator) Next() (*genprotopb.Session, error) {
+	var item *genprotopb.Session
+	if err := it.nextFunc(); err != nil {
+		return item, err
+	}
+	item = it.items[0]
+	it.items = it.items[1:]
+	return item, nil
+}
+
+func (it *SessionIterator) bufLen() int {
+	return len(it.items)
+}
+
+func (it *SessionIterator) takeBuf() interface{} {
+	b := it.items
+	it.items = nil
+	return b
+}
+
+// TestIterator manages a stream of *genprotopb.Test.
+type TestIterator struct {
+	items    []*genprotopb.Test
+	pageInfo *iterator.PageInfo
+	nextFunc func() error
+
+	// Response is the raw response for the current page.
+	// It must be cast to the RPC response type.
+	// Calling Next() or InternalFetch() updates this value.
+	Response interface{}
+
+	// InternalFetch is for use by the Google Cloud Libraries only.
+	// It is not part of the stable interface of this package.
+	//
+	// InternalFetch returns results from a single call to the underlying RPC.
+	// The number of results is no greater than pageSize.
+	// If there are no more results, nextPageToken is empty and err is nil.
+	InternalFetch func(pageSize int, pageToken string) (results []*genprotopb.Test, nextPageToken string, err error)
+}
+
+// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
+func (it *TestIterator) PageInfo() *iterator.PageInfo {
+	return it.pageInfo
+}
+
+// Next returns the next result. Its second return value is iterator.Done if there are no more
+// results. Once Next returns Done, all subsequent calls will return Done.
+func (it *TestIterator) Next() (*genprotopb.Test, error) {
+	var item *genprotopb.Test
+	if err := it.nextFunc(); err != nil {
+		return item, err
+	}
+	item = it.items[0]
+	it.items = it.items[1:]
+	return item, nil
+}
+
+func (it *TestIterator) bufLen() int {
+	return len(it.items)
+}
+
+func (it *TestIterator) takeBuf() interface{} {
+	b := it.items
+	it.items = nil
+	return b
+}
+
+// UserIterator manages a stream of *genprotopb.User.
+type UserIterator struct {
+	items    []*genprotopb.User
+	pageInfo *iterator.PageInfo
+	nextFunc func() error
+
+	// Response is the raw response for the current page.
+	// It must be cast to the RPC response type.
+	// Calling Next() or InternalFetch() updates this value.
+	Response interface{}
+
+	// InternalFetch is for use by the Google Cloud Libraries only.
+	// It is not part of the stable interface of this package.
+	//
+	// InternalFetch returns results from a single call to the underlying RPC.
+	// The number of results is no greater than pageSize.
+	// If there are no more results, nextPageToken is empty and err is nil.
+	InternalFetch func(pageSize int, pageToken string) (results []*genprotopb.User, nextPageToken string, err error)
+}
+
+// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
+func (it *UserIterator) PageInfo() *iterator.PageInfo {
+	return it.pageInfo
+}
+
+// Next returns the next result. Its second return value is iterator.Done if there are no more
+// results. Once Next returns Done, all subsequent calls will return Done.
+func (it *UserIterator) Next() (*genprotopb.User, error) {
+	var item *genprotopb.User
+	if err := it.nextFunc(); err != nil {
+		return item, err
+	}
+	item = it.items[0]
+	it.items = it.items[1:]
+	return item, nil
+}
+
+func (it *UserIterator) bufLen() int {
+	return len(it.items)
+}
+
+func (it *UserIterator) takeBuf() interface{} {
+	b := it.items
+	it.items = nil
+	return b
+}
diff --git a/client/compliance_client.go b/client/compliance_client.go
index 2cdfecedb..b57957d6b 100644
--- a/client/compliance_client.go
+++ b/client/compliance_client.go
@@ -2719,97 +2719,3 @@ func (c *complianceRESTClient) CancelOperation(ctx context.Context, req *longrun
 		return googleapi.CheckResponse(httpRsp)
 	}, opts...)
 }
-
-// LocationIterator manages a stream of *locationpb.Location.
-type LocationIterator struct {
-	items    []*locationpb.Location
-	pageInfo *iterator.PageInfo
-	nextFunc func() error
-
-	// Response is the raw response for the current page.
-	// It must be cast to the RPC response type.
-	// Calling Next() or InternalFetch() updates this value.
-	Response interface{}
-
-	// InternalFetch is for use by the Google Cloud Libraries only.
-	// It is not part of the stable interface of this package.
-	//
-	// InternalFetch returns results from a single call to the underlying RPC.
-	// The number of results is no greater than pageSize.
-	// If there are no more results, nextPageToken is empty and err is nil.
-	InternalFetch func(pageSize int, pageToken string) (results []*locationpb.Location, nextPageToken string, err error)
-}
-
-// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
-func (it *LocationIterator) PageInfo() *iterator.PageInfo {
-	return it.pageInfo
-}
-
-// Next returns the next result. Its second return value is iterator.Done if there are no more
-// results. Once Next returns Done, all subsequent calls will return Done.
-func (it *LocationIterator) Next() (*locationpb.Location, error) {
-	var item *locationpb.Location
-	if err := it.nextFunc(); err != nil {
-		return item, err
-	}
-	item = it.items[0]
-	it.items = it.items[1:]
-	return item, nil
-}
-
-func (it *LocationIterator) bufLen() int {
-	return len(it.items)
-}
-
-func (it *LocationIterator) takeBuf() interface{} {
-	b := it.items
-	it.items = nil
-	return b
-}
-
-// OperationIterator manages a stream of *longrunningpb.Operation.
-type OperationIterator struct {
-	items    []*longrunningpb.Operation
-	pageInfo *iterator.PageInfo
-	nextFunc func() error
-
-	// Response is the raw response for the current page.
-	// It must be cast to the RPC response type.
-	// Calling Next() or InternalFetch() updates this value.
-	Response interface{}
-
-	// InternalFetch is for use by the Google Cloud Libraries only.
-	// It is not part of the stable interface of this package.
-	//
-	// InternalFetch returns results from a single call to the underlying RPC.
-	// The number of results is no greater than pageSize.
-	// If there are no more results, nextPageToken is empty and err is nil.
-	InternalFetch func(pageSize int, pageToken string) (results []*longrunningpb.Operation, nextPageToken string, err error)
-}
-
-// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
-func (it *OperationIterator) PageInfo() *iterator.PageInfo {
-	return it.pageInfo
-}
-
-// Next returns the next result. Its second return value is iterator.Done if there are no more
-// results. Once Next returns Done, all subsequent calls will return Done.
-func (it *OperationIterator) Next() (*longrunningpb.Operation, error) {
-	var item *longrunningpb.Operation
-	if err := it.nextFunc(); err != nil {
-		return item, err
-	}
-	item = it.items[0]
-	it.items = it.items[1:]
-	return item, nil
-}
-
-func (it *OperationIterator) bufLen() int {
-	return len(it.items)
-}
-
-func (it *OperationIterator) takeBuf() interface{} {
-	b := it.items
-	it.items = nil
-	return b
-}
diff --git a/client/compliance_client_example_test.go b/client/compliance_client_example_test.go
index 518dbdddb..ff73d151a 100644
--- a/client/compliance_client_example_test.go
+++ b/client/compliance_client_example_test.go
@@ -61,7 +61,7 @@ func ExampleNewComplianceRESTClient() {
 	_ = c
 }
 
-func ExampleComplianceClient_RepeatDataBody() {
+func ExampleComplianceClient_GetEnum() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -74,11 +74,11 @@ func ExampleComplianceClient_RepeatDataBody() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.RepeatRequest{
+	req := &genprotopb.EnumRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#RepeatRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#EnumRequest.
 	}
-	resp, err := c.RepeatDataBody(ctx, req)
+	resp, err := c.GetEnum(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
@@ -86,7 +86,7 @@ func ExampleComplianceClient_RepeatDataBody() {
 	_ = resp
 }
 
-func ExampleComplianceClient_RepeatDataBodyInfo() {
+func ExampleComplianceClient_RepeatDataBody() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -103,7 +103,7 @@ func ExampleComplianceClient_RepeatDataBodyInfo() {
 		// TODO: Fill request struct fields.
 		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#RepeatRequest.
 	}
-	resp, err := c.RepeatDataBodyInfo(ctx, req)
+	resp, err := c.RepeatDataBody(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
@@ -111,7 +111,7 @@ func ExampleComplianceClient_RepeatDataBodyInfo() {
 	_ = resp
 }
 
-func ExampleComplianceClient_RepeatDataQuery() {
+func ExampleComplianceClient_RepeatDataBodyInfo() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -128,7 +128,7 @@ func ExampleComplianceClient_RepeatDataQuery() {
 		// TODO: Fill request struct fields.
 		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#RepeatRequest.
 	}
-	resp, err := c.RepeatDataQuery(ctx, req)
+	resp, err := c.RepeatDataBodyInfo(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
@@ -136,7 +136,7 @@ func ExampleComplianceClient_RepeatDataQuery() {
 	_ = resp
 }
 
-func ExampleComplianceClient_RepeatDataSimplePath() {
+func ExampleComplianceClient_RepeatDataBodyPatch() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -153,7 +153,7 @@ func ExampleComplianceClient_RepeatDataSimplePath() {
 		// TODO: Fill request struct fields.
 		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#RepeatRequest.
 	}
-	resp, err := c.RepeatDataSimplePath(ctx, req)
+	resp, err := c.RepeatDataBodyPatch(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
@@ -161,7 +161,7 @@ func ExampleComplianceClient_RepeatDataSimplePath() {
 	_ = resp
 }
 
-func ExampleComplianceClient_RepeatDataPathResource() {
+func ExampleComplianceClient_RepeatDataBodyPut() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -178,7 +178,7 @@ func ExampleComplianceClient_RepeatDataPathResource() {
 		// TODO: Fill request struct fields.
 		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#RepeatRequest.
 	}
-	resp, err := c.RepeatDataPathResource(ctx, req)
+	resp, err := c.RepeatDataBodyPut(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
@@ -186,7 +186,7 @@ func ExampleComplianceClient_RepeatDataPathResource() {
 	_ = resp
 }
 
-func ExampleComplianceClient_RepeatDataPathTrailingResource() {
+func ExampleComplianceClient_RepeatDataPathResource() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -203,7 +203,7 @@ func ExampleComplianceClient_RepeatDataPathTrailingResource() {
 		// TODO: Fill request struct fields.
 		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#RepeatRequest.
 	}
-	resp, err := c.RepeatDataPathTrailingResource(ctx, req)
+	resp, err := c.RepeatDataPathResource(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
@@ -211,7 +211,7 @@ func ExampleComplianceClient_RepeatDataPathTrailingResource() {
 	_ = resp
 }
 
-func ExampleComplianceClient_RepeatDataBodyPut() {
+func ExampleComplianceClient_RepeatDataPathTrailingResource() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -228,7 +228,7 @@ func ExampleComplianceClient_RepeatDataBodyPut() {
 		// TODO: Fill request struct fields.
 		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#RepeatRequest.
 	}
-	resp, err := c.RepeatDataBodyPut(ctx, req)
+	resp, err := c.RepeatDataPathTrailingResource(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
@@ -236,7 +236,7 @@ func ExampleComplianceClient_RepeatDataBodyPut() {
 	_ = resp
 }
 
-func ExampleComplianceClient_RepeatDataBodyPatch() {
+func ExampleComplianceClient_RepeatDataQuery() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -253,7 +253,7 @@ func ExampleComplianceClient_RepeatDataBodyPatch() {
 		// TODO: Fill request struct fields.
 		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#RepeatRequest.
 	}
-	resp, err := c.RepeatDataBodyPatch(ctx, req)
+	resp, err := c.RepeatDataQuery(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
@@ -261,7 +261,7 @@ func ExampleComplianceClient_RepeatDataBodyPatch() {
 	_ = resp
 }
 
-func ExampleComplianceClient_GetEnum() {
+func ExampleComplianceClient_RepeatDataSimplePath() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -274,11 +274,11 @@ func ExampleComplianceClient_GetEnum() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.EnumRequest{
+	req := &genprotopb.RepeatRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#EnumRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#RepeatRequest.
 	}
-	resp, err := c.GetEnum(ctx, req)
+	resp, err := c.RepeatDataSimplePath(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
diff --git a/client/doc.go b/client/doc.go
index 7a0268833..8afb7466c 100644
--- a/client/doc.go
+++ b/client/doc.go
@@ -68,11 +68,11 @@
 //	}
 //	defer c.Close()
 //
-//	req := &genprotopb.RepeatRequest{
+//	req := &genprotopb.EnumRequest{
 //		// TODO: Fill request struct fields.
-//		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#RepeatRequest.
+//		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#EnumRequest.
 //	}
-//	resp, err := c.RepeatDataBody(ctx, req)
+//	resp, err := c.GetEnum(ctx, req)
 //	if err != nil {
 //		// TODO: Handle error.
 //	}
diff --git a/client/echo_client.go b/client/echo_client.go
index ee34034db..7c734dbad 100644
--- a/client/echo_client.go
+++ b/client/echo_client.go
@@ -54,6 +54,7 @@ var newEchoClientHook clientHook
 // EchoCallOptions contains the retry settings for each method of EchoClient.
 type EchoCallOptions struct {
 	Echo                    []gax.CallOption
+	EchoErrorDetails        []gax.CallOption
 	Expand                  []gax.CallOption
 	Collect                 []gax.CallOption
 	Chat                    []gax.CallOption
@@ -100,6 +101,9 @@ func defaultEchoCallOptions() *EchoCallOptions {
 				})
 			}),
 		},
+		EchoErrorDetails: []gax.CallOption{
+			gax.WithTimeout(5000 * time.Millisecond),
+		},
 		Expand: []gax.CallOption{
 			gax.WithRetry(func() gax.Retryer {
 				return gax.OnCodes([]codes.Code{
@@ -165,6 +169,9 @@ func defaultEchoRESTCallOptions() *EchoCallOptions {
 					http.StatusInternalServerError)
 			}),
 		},
+		EchoErrorDetails: []gax.CallOption{
+			gax.WithTimeout(5000 * time.Millisecond),
+		},
 		Expand: []gax.CallOption{
 			gax.WithTimeout(10000 * time.Millisecond),
 			gax.WithRetry(func() gax.Retryer {
@@ -225,6 +232,7 @@ type internalEchoClient interface {
 	setGoogleClientInfo(...string)
 	Connection() *grpc.ClientConn
 	Echo(context.Context, *genprotopb.EchoRequest, ...gax.CallOption) (*genprotopb.EchoResponse, error)
+	EchoErrorDetails(context.Context, *genprotopb.EchoErrorDetailsRequest, ...gax.CallOption) (*genprotopb.EchoErrorDetailsResponse, error)
 	Expand(context.Context, *genprotopb.ExpandRequest, ...gax.CallOption) (genprotopb.Echo_ExpandClient, error)
 	Collect(context.Context, ...gax.CallOption) (genprotopb.Echo_CollectClient, error)
 	Chat(context.Context, ...gax.CallOption) (genprotopb.Echo_ChatClient, error)
@@ -296,6 +304,16 @@ func (c *EchoClient) Echo(ctx context.Context, req *genprotopb.EchoRequest, opts
 	return c.internalClient.Echo(ctx, req, opts...)
 }
 
+// EchoErrorDetails this method returns error details in a repeated “google.protobuf.Any”
+// field. This method showcases handling errors thus encoded, particularly
+// over REST transport. Note that GAPICs only allow the type
+// “google.protobuf.Any” for field paths ending in “error.details”, and, at
+// run-time, the actual types for these fields must be one of the types in
+// google/rpc/error_details.proto.
+func (c *EchoClient) EchoErrorDetails(ctx context.Context, req *genprotopb.EchoErrorDetailsRequest, opts ...gax.CallOption) (*genprotopb.EchoErrorDetailsResponse, error) {
+	return c.internalClient.EchoErrorDetails(ctx, req, opts...)
+}
+
 // Expand this method splits the given content into words and will pass each word back
 // through the stream. This method showcases server-side streaming RPCs.
 func (c *EchoClient) Expand(ctx context.Context, req *genprotopb.ExpandRequest, opts ...gax.CallOption) (genprotopb.Echo_ExpandClient, error) {
@@ -646,6 +664,21 @@ func (c *echoGRPCClient) Echo(ctx context.Context, req *genprotopb.EchoRequest,
 	return resp, nil
 }
 
+func (c *echoGRPCClient) EchoErrorDetails(ctx context.Context, req *genprotopb.EchoErrorDetailsRequest, opts ...gax.CallOption) (*genprotopb.EchoErrorDetailsResponse, error) {
+	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, c.xGoogHeaders...)
+	opts = append((*c.CallOptions).EchoErrorDetails[0:len((*c.CallOptions).EchoErrorDetails):len((*c.CallOptions).EchoErrorDetails)], opts...)
+	var resp *genprotopb.EchoErrorDetailsResponse
+	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
+		var err error
+		resp, err = c.echoClient.EchoErrorDetails(ctx, req, settings.GRPC...)
+		return err
+	}, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return resp, nil
+}
+
 func (c *echoGRPCClient) Expand(ctx context.Context, req *genprotopb.ExpandRequest, opts ...gax.CallOption) (genprotopb.Echo_ExpandClient, error) {
 	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, c.xGoogHeaders...)
 	opts = append((*c.CallOptions).Expand[0:len((*c.CallOptions).Expand):len((*c.CallOptions).Expand)], opts...)
@@ -1157,6 +1190,69 @@ func (c *echoRESTClient) Echo(ctx context.Context, req *genprotopb.EchoRequest,
 	return resp, nil
 }
 
+// EchoErrorDetails this method returns error details in a repeated “google.protobuf.Any”
+// field. This method showcases handling errors thus encoded, particularly
+// over REST transport. Note that GAPICs only allow the type
+// “google.protobuf.Any” for field paths ending in “error.details”, and, at
+// run-time, the actual types for these fields must be one of the types in
+// google/rpc/error_details.proto.
+func (c *echoRESTClient) EchoErrorDetails(ctx context.Context, req *genprotopb.EchoErrorDetailsRequest, opts ...gax.CallOption) (*genprotopb.EchoErrorDetailsResponse, error) {
+	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
+	jsonReq, err := m.Marshal(req)
+	if err != nil {
+		return nil, err
+	}
+
+	baseUrl, err := url.Parse(c.endpoint)
+	if err != nil {
+		return nil, err
+	}
+	baseUrl.Path += fmt.Sprintf("/v1beta1/echo:error-details")
+
+	// Build HTTP headers from client and context metadata.
+	hds := append(c.xGoogHeaders, "Content-Type", "application/json")
+	headers := gax.BuildHeaders(ctx, hds...)
+	opts = append((*c.CallOptions).EchoErrorDetails[0:len((*c.CallOptions).EchoErrorDetails):len((*c.CallOptions).EchoErrorDetails)], opts...)
+	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
+	resp := &genprotopb.EchoErrorDetailsResponse{}
+	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
+		if settings.Path != "" {
+			baseUrl.Path = settings.Path
+		}
+		httpReq, err := http.NewRequest("POST", baseUrl.String(), bytes.NewReader(jsonReq))
+		if err != nil {
+			return err
+		}
+		httpReq = httpReq.WithContext(ctx)
+		httpReq.Header = headers
+
+		httpRsp, err := c.httpClient.Do(httpReq)
+		if err != nil {
+			return err
+		}
+		defer httpRsp.Body.Close()
+
+		if err = googleapi.CheckResponse(httpRsp); err != nil {
+			return err
+		}
+
+		buf, err := io.ReadAll(httpRsp.Body)
+		if err != nil {
+			return err
+		}
+
+		if err := unm.Unmarshal(buf, resp); err != nil {
+			return err
+		}
+
+		return nil
+	}, opts...)
+	if e != nil {
+		return nil, e
+	}
+	return resp, nil
+}
+
 // Expand this method splits the given content into words and will pass each word back
 // through the stream. This method showcases server-side streaming RPCs.
 func (c *echoRESTClient) Expand(ctx context.Context, req *genprotopb.ExpandRequest, opts ...gax.CallOption) (genprotopb.Echo_ExpandClient, error) {
@@ -2216,12 +2312,6 @@ func (c *echoRESTClient) CancelOperation(ctx context.Context, req *longrunningpb
 	}, opts...)
 }
 
-// WaitOperation manages a long-running operation from Wait.
-type WaitOperation struct {
-	lro      *longrunning.Operation
-	pollPath string
-}
-
 // WaitOperation returns a new WaitOperation from a given name.
 // The name must be that of a previously created WaitOperation, possibly from a different process.
 func (c *echoGRPCClient) WaitOperation(name string) *WaitOperation {
@@ -2239,161 +2329,3 @@ func (c *echoRESTClient) WaitOperation(name string) *WaitOperation {
 		pollPath: override,
 	}
 }
-
-// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
-//
-// See documentation of Poll for error-handling information.
-func (op *WaitOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*genprotopb.WaitResponse, error) {
-	opts = append([]gax.CallOption{gax.WithPath(op.pollPath)}, opts...)
-	var resp genprotopb.WaitResponse
-	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
-		return nil, err
-	}
-	return &resp, nil
-}
-
-// Poll fetches the latest state of the long-running operation.
-//
-// Poll also fetches the latest metadata, which can be retrieved by Metadata.
-//
-// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
-// the operation has completed with failure, the error is returned and op.Done will return true.
-// If Poll succeeds and the operation has completed successfully,
-// op.Done will return true, and the response of the operation is returned.
-// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
-func (op *WaitOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*genprotopb.WaitResponse, error) {
-	opts = append([]gax.CallOption{gax.WithPath(op.pollPath)}, opts...)
-	var resp genprotopb.WaitResponse
-	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
-		return nil, err
-	}
-	if !op.Done() {
-		return nil, nil
-	}
-	return &resp, nil
-}
-
-// Metadata returns metadata associated with the long-running operation.
-// Metadata itself does not contact the server, but Poll does.
-// To get the latest metadata, call this method after a successful call to Poll.
-// If the metadata is not available, the returned metadata and error are both nil.
-func (op *WaitOperation) Metadata() (*genprotopb.WaitMetadata, error) {
-	var meta genprotopb.WaitMetadata
-	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
-		return nil, nil
-	} else if err != nil {
-		return nil, err
-	}
-	return &meta, nil
-}
-
-// Done reports whether the long-running operation has completed.
-func (op *WaitOperation) Done() bool {
-	return op.lro.Done()
-}
-
-// Name returns the name of the long-running operation.
-// The name is assigned by the server and is unique within the service from which the operation is created.
-func (op *WaitOperation) Name() string {
-	return op.lro.Name()
-}
-
-// EchoResponseIterator manages a stream of *genprotopb.EchoResponse.
-type EchoResponseIterator struct {
-	items    []*genprotopb.EchoResponse
-	pageInfo *iterator.PageInfo
-	nextFunc func() error
-
-	// Response is the raw response for the current page.
-	// It must be cast to the RPC response type.
-	// Calling Next() or InternalFetch() updates this value.
-	Response interface{}
-
-	// InternalFetch is for use by the Google Cloud Libraries only.
-	// It is not part of the stable interface of this package.
-	//
-	// InternalFetch returns results from a single call to the underlying RPC.
-	// The number of results is no greater than pageSize.
-	// If there are no more results, nextPageToken is empty and err is nil.
-	InternalFetch func(pageSize int, pageToken string) (results []*genprotopb.EchoResponse, nextPageToken string, err error)
-}
-
-// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
-func (it *EchoResponseIterator) PageInfo() *iterator.PageInfo {
-	return it.pageInfo
-}
-
-// Next returns the next result. Its second return value is iterator.Done if there are no more
-// results. Once Next returns Done, all subsequent calls will return Done.
-func (it *EchoResponseIterator) Next() (*genprotopb.EchoResponse, error) {
-	var item *genprotopb.EchoResponse
-	if err := it.nextFunc(); err != nil {
-		return item, err
-	}
-	item = it.items[0]
-	it.items = it.items[1:]
-	return item, nil
-}
-
-func (it *EchoResponseIterator) bufLen() int {
-	return len(it.items)
-}
-
-func (it *EchoResponseIterator) takeBuf() interface{} {
-	b := it.items
-	it.items = nil
-	return b
-}
-
-// PagedExpandResponseListPair is a holder type for string/*genprotopb.PagedExpandResponseList map entries
-type PagedExpandResponseListPair struct {
-	Key   string
-	Value *genprotopb.PagedExpandResponseList
-}
-
-// PagedExpandResponseListPairIterator manages a stream of PagedExpandResponseListPair.
-type PagedExpandResponseListPairIterator struct {
-	items    []PagedExpandResponseListPair
-	pageInfo *iterator.PageInfo
-	nextFunc func() error
-
-	// Response is the raw response for the current page.
-	// It must be cast to the RPC response type.
-	// Calling Next() or InternalFetch() updates this value.
-	Response interface{}
-
-	// InternalFetch is for use by the Google Cloud Libraries only.
-	// It is not part of the stable interface of this package.
-	//
-	// InternalFetch returns results from a single call to the underlying RPC.
-	// The number of results is no greater than pageSize.
-	// If there are no more results, nextPageToken is empty and err is nil.
-	InternalFetch func(pageSize int, pageToken string) (results []PagedExpandResponseListPair, nextPageToken string, err error)
-}
-
-// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
-func (it *PagedExpandResponseListPairIterator) PageInfo() *iterator.PageInfo {
-	return it.pageInfo
-}
-
-// Next returns the next result. Its second return value is iterator.Done if there are no more
-// results. Once Next returns Done, all subsequent calls will return Done.
-func (it *PagedExpandResponseListPairIterator) Next() (PagedExpandResponseListPair, error) {
-	var item PagedExpandResponseListPair
-	if err := it.nextFunc(); err != nil {
-		return item, err
-	}
-	item = it.items[0]
-	it.items = it.items[1:]
-	return item, nil
-}
-
-func (it *PagedExpandResponseListPairIterator) bufLen() int {
-	return len(it.items)
-}
-
-func (it *PagedExpandResponseListPairIterator) takeBuf() interface{} {
-	b := it.items
-	it.items = nil
-	return b
-}
diff --git a/client/echo_client_example_test.go b/client/echo_client_example_test.go
index 4537828be..14bff1e53 100644
--- a/client/echo_client_example_test.go
+++ b/client/echo_client_example_test.go
@@ -62,7 +62,7 @@ func ExampleNewEchoRESTClient() {
 	_ = c
 }
 
-func ExampleEchoClient_Echo() {
+func ExampleEchoClient_Block() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -75,11 +75,11 @@ func ExampleEchoClient_Echo() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.EchoRequest{
+	req := &genprotopb.BlockRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#EchoRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#BlockRequest.
 	}
-	resp, err := c.Echo(ctx, req)
+	resp, err := c.Block(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
@@ -127,6 +127,56 @@ func ExampleEchoClient_Chat() {
 	}
 }
 
+func ExampleEchoClient_Echo() {
+	ctx := context.Background()
+	// This snippet has been automatically generated and should be regarded as a code template only.
+	// It will require modifications to work:
+	// - It may require correct/in-range values for request initialization.
+	// - It may require specifying regional endpoints when creating the service client as shown in:
+	//   https://pkg.go.dev/cloud.google.com/go#hdr-Client_Options
+	c, err := client.NewEchoClient(ctx)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	defer c.Close()
+
+	req := &genprotopb.EchoRequest{
+		// TODO: Fill request struct fields.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#EchoRequest.
+	}
+	resp, err := c.Echo(ctx, req)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	// TODO: Use resp.
+	_ = resp
+}
+
+func ExampleEchoClient_EchoErrorDetails() {
+	ctx := context.Background()
+	// This snippet has been automatically generated and should be regarded as a code template only.
+	// It will require modifications to work:
+	// - It may require correct/in-range values for request initialization.
+	// - It may require specifying regional endpoints when creating the service client as shown in:
+	//   https://pkg.go.dev/cloud.google.com/go#hdr-Client_Options
+	c, err := client.NewEchoClient(ctx)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	defer c.Close()
+
+	req := &genprotopb.EchoErrorDetailsRequest{
+		// TODO: Fill request struct fields.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#EchoErrorDetailsRequest.
+	}
+	resp, err := c.EchoErrorDetails(ctx, req)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	// TODO: Use resp.
+	_ = resp
+}
+
 func ExampleEchoClient_PagedExpand() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
@@ -250,31 +300,6 @@ func ExampleEchoClient_Wait() {
 	_ = resp
 }
 
-func ExampleEchoClient_Block() {
-	ctx := context.Background()
-	// This snippet has been automatically generated and should be regarded as a code template only.
-	// It will require modifications to work:
-	// - It may require correct/in-range values for request initialization.
-	// - It may require specifying regional endpoints when creating the service client as shown in:
-	//   https://pkg.go.dev/cloud.google.com/go#hdr-Client_Options
-	c, err := client.NewEchoClient(ctx)
-	if err != nil {
-		// TODO: Handle error.
-	}
-	defer c.Close()
-
-	req := &genprotopb.BlockRequest{
-		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#BlockRequest.
-	}
-	resp, err := c.Block(ctx, req)
-	if err != nil {
-		// TODO: Handle error.
-	}
-	// TODO: Use resp.
-	_ = resp
-}
-
 func ExampleEchoClient_ListLocations() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
diff --git a/client/gapic_metadata.json b/client/gapic_metadata.json
index 9b27da6a1..45420439f 100644
--- a/client/gapic_metadata.json
+++ b/client/gapic_metadata.json
@@ -244,6 +244,11 @@
                 "Echo"
               ]
             },
+            "EchoErrorDetails": {
+              "methods": [
+                "EchoErrorDetails"
+              ]
+            },
             "Expand": {
               "methods": [
                 "Expand"
@@ -339,6 +344,11 @@
                 "Echo"
               ]
             },
+            "EchoErrorDetails": {
+              "methods": [
+                "EchoErrorDetails"
+              ]
+            },
             "Expand": {
               "methods": [
                 "Expand"
diff --git a/client/identity_client.go b/client/identity_client.go
index ef08e8f75..c4e869d3f 100644
--- a/client/identity_client.go
+++ b/client/identity_client.go
@@ -1612,50 +1612,3 @@ func (c *identityRESTClient) CancelOperation(ctx context.Context, req *longrunni
 		return googleapi.CheckResponse(httpRsp)
 	}, opts...)
 }
-
-// UserIterator manages a stream of *genprotopb.User.
-type UserIterator struct {
-	items    []*genprotopb.User
-	pageInfo *iterator.PageInfo
-	nextFunc func() error
-
-	// Response is the raw response for the current page.
-	// It must be cast to the RPC response type.
-	// Calling Next() or InternalFetch() updates this value.
-	Response interface{}
-
-	// InternalFetch is for use by the Google Cloud Libraries only.
-	// It is not part of the stable interface of this package.
-	//
-	// InternalFetch returns results from a single call to the underlying RPC.
-	// The number of results is no greater than pageSize.
-	// If there are no more results, nextPageToken is empty and err is nil.
-	InternalFetch func(pageSize int, pageToken string) (results []*genprotopb.User, nextPageToken string, err error)
-}
-
-// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
-func (it *UserIterator) PageInfo() *iterator.PageInfo {
-	return it.pageInfo
-}
-
-// Next returns the next result. Its second return value is iterator.Done if there are no more
-// results. Once Next returns Done, all subsequent calls will return Done.
-func (it *UserIterator) Next() (*genprotopb.User, error) {
-	var item *genprotopb.User
-	if err := it.nextFunc(); err != nil {
-		return item, err
-	}
-	item = it.items[0]
-	it.items = it.items[1:]
-	return item, nil
-}
-
-func (it *UserIterator) bufLen() int {
-	return len(it.items)
-}
-
-func (it *UserIterator) takeBuf() interface{} {
-	b := it.items
-	it.items = nil
-	return b
-}
diff --git a/client/identity_client_example_test.go b/client/identity_client_example_test.go
index 7bcb64d1d..f99bbf91e 100644
--- a/client/identity_client_example_test.go
+++ b/client/identity_client_example_test.go
@@ -86,7 +86,7 @@ func ExampleIdentityClient_CreateUser() {
 	_ = resp
 }
 
-func ExampleIdentityClient_GetUser() {
+func ExampleIdentityClient_DeleteUser() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -99,19 +99,17 @@ func ExampleIdentityClient_GetUser() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.GetUserRequest{
+	req := &genprotopb.DeleteUserRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#GetUserRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#DeleteUserRequest.
 	}
-	resp, err := c.GetUser(ctx, req)
+	err = c.DeleteUser(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
-	// TODO: Use resp.
-	_ = resp
 }
 
-func ExampleIdentityClient_UpdateUser() {
+func ExampleIdentityClient_GetUser() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -124,11 +122,11 @@ func ExampleIdentityClient_UpdateUser() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.UpdateUserRequest{
+	req := &genprotopb.GetUserRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#UpdateUserRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#GetUserRequest.
 	}
-	resp, err := c.UpdateUser(ctx, req)
+	resp, err := c.GetUser(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
@@ -136,7 +134,7 @@ func ExampleIdentityClient_UpdateUser() {
 	_ = resp
 }
 
-func ExampleIdentityClient_DeleteUser() {
+func ExampleIdentityClient_ListUsers() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -149,17 +147,25 @@ func ExampleIdentityClient_DeleteUser() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.DeleteUserRequest{
+	req := &genprotopb.ListUsersRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#DeleteUserRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#ListUsersRequest.
 	}
-	err = c.DeleteUser(ctx, req)
-	if err != nil {
-		// TODO: Handle error.
+	it := c.ListUsers(ctx, req)
+	for {
+		resp, err := it.Next()
+		if err == iterator.Done {
+			break
+		}
+		if err != nil {
+			// TODO: Handle error.
+		}
+		// TODO: Use resp.
+		_ = resp
 	}
 }
 
-func ExampleIdentityClient_ListUsers() {
+func ExampleIdentityClient_UpdateUser() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -172,22 +178,16 @@ func ExampleIdentityClient_ListUsers() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.ListUsersRequest{
+	req := &genprotopb.UpdateUserRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#ListUsersRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#UpdateUserRequest.
 	}
-	it := c.ListUsers(ctx, req)
-	for {
-		resp, err := it.Next()
-		if err == iterator.Done {
-			break
-		}
-		if err != nil {
-			// TODO: Handle error.
-		}
-		// TODO: Use resp.
-		_ = resp
+	resp, err := c.UpdateUser(ctx, req)
+	if err != nil {
+		// TODO: Handle error.
 	}
+	// TODO: Use resp.
+	_ = resp
 }
 
 func ExampleIdentityClient_ListLocations() {
diff --git a/client/messaging_client.go b/client/messaging_client.go
index 0dc64e9e6..48223212b 100644
--- a/client/messaging_client.go
+++ b/client/messaging_client.go
@@ -2568,12 +2568,6 @@ func (c *messagingRESTClient) CancelOperation(ctx context.Context, req *longrunn
 	}, opts...)
 }
 
-// SearchBlurbsOperation manages a long-running operation from SearchBlurbs.
-type SearchBlurbsOperation struct {
-	lro      *longrunning.Operation
-	pollPath string
-}
-
 // SearchBlurbsOperation returns a new SearchBlurbsOperation from a given name.
 // The name must be that of a previously created SearchBlurbsOperation, possibly from a different process.
 func (c *messagingGRPCClient) SearchBlurbsOperation(name string) *SearchBlurbsOperation {
@@ -2591,155 +2585,3 @@ func (c *messagingRESTClient) SearchBlurbsOperation(name string) *SearchBlurbsOp
 		pollPath: override,
 	}
 }
-
-// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
-//
-// See documentation of Poll for error-handling information.
-func (op *SearchBlurbsOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*genprotopb.SearchBlurbsResponse, error) {
-	opts = append([]gax.CallOption{gax.WithPath(op.pollPath)}, opts...)
-	var resp genprotopb.SearchBlurbsResponse
-	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
-		return nil, err
-	}
-	return &resp, nil
-}
-
-// Poll fetches the latest state of the long-running operation.
-//
-// Poll also fetches the latest metadata, which can be retrieved by Metadata.
-//
-// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
-// the operation has completed with failure, the error is returned and op.Done will return true.
-// If Poll succeeds and the operation has completed successfully,
-// op.Done will return true, and the response of the operation is returned.
-// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
-func (op *SearchBlurbsOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*genprotopb.SearchBlurbsResponse, error) {
-	opts = append([]gax.CallOption{gax.WithPath(op.pollPath)}, opts...)
-	var resp genprotopb.SearchBlurbsResponse
-	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
-		return nil, err
-	}
-	if !op.Done() {
-		return nil, nil
-	}
-	return &resp, nil
-}
-
-// Metadata returns metadata associated with the long-running operation.
-// Metadata itself does not contact the server, but Poll does.
-// To get the latest metadata, call this method after a successful call to Poll.
-// If the metadata is not available, the returned metadata and error are both nil.
-func (op *SearchBlurbsOperation) Metadata() (*genprotopb.SearchBlurbsMetadata, error) {
-	var meta genprotopb.SearchBlurbsMetadata
-	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
-		return nil, nil
-	} else if err != nil {
-		return nil, err
-	}
-	return &meta, nil
-}
-
-// Done reports whether the long-running operation has completed.
-func (op *SearchBlurbsOperation) Done() bool {
-	return op.lro.Done()
-}
-
-// Name returns the name of the long-running operation.
-// The name is assigned by the server and is unique within the service from which the operation is created.
-func (op *SearchBlurbsOperation) Name() string {
-	return op.lro.Name()
-}
-
-// BlurbIterator manages a stream of *genprotopb.Blurb.
-type BlurbIterator struct {
-	items    []*genprotopb.Blurb
-	pageInfo *iterator.PageInfo
-	nextFunc func() error
-
-	// Response is the raw response for the current page.
-	// It must be cast to the RPC response type.
-	// Calling Next() or InternalFetch() updates this value.
-	Response interface{}
-
-	// InternalFetch is for use by the Google Cloud Libraries only.
-	// It is not part of the stable interface of this package.
-	//
-	// InternalFetch returns results from a single call to the underlying RPC.
-	// The number of results is no greater than pageSize.
-	// If there are no more results, nextPageToken is empty and err is nil.
-	InternalFetch func(pageSize int, pageToken string) (results []*genprotopb.Blurb, nextPageToken string, err error)
-}
-
-// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
-func (it *BlurbIterator) PageInfo() *iterator.PageInfo {
-	return it.pageInfo
-}
-
-// Next returns the next result. Its second return value is iterator.Done if there are no more
-// results. Once Next returns Done, all subsequent calls will return Done.
-func (it *BlurbIterator) Next() (*genprotopb.Blurb, error) {
-	var item *genprotopb.Blurb
-	if err := it.nextFunc(); err != nil {
-		return item, err
-	}
-	item = it.items[0]
-	it.items = it.items[1:]
-	return item, nil
-}
-
-func (it *BlurbIterator) bufLen() int {
-	return len(it.items)
-}
-
-func (it *BlurbIterator) takeBuf() interface{} {
-	b := it.items
-	it.items = nil
-	return b
-}
-
-// RoomIterator manages a stream of *genprotopb.Room.
-type RoomIterator struct {
-	items    []*genprotopb.Room
-	pageInfo *iterator.PageInfo
-	nextFunc func() error
-
-	// Response is the raw response for the current page.
-	// It must be cast to the RPC response type.
-	// Calling Next() or InternalFetch() updates this value.
-	Response interface{}
-
-	// InternalFetch is for use by the Google Cloud Libraries only.
-	// It is not part of the stable interface of this package.
-	//
-	// InternalFetch returns results from a single call to the underlying RPC.
-	// The number of results is no greater than pageSize.
-	// If there are no more results, nextPageToken is empty and err is nil.
-	InternalFetch func(pageSize int, pageToken string) (results []*genprotopb.Room, nextPageToken string, err error)
-}
-
-// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
-func (it *RoomIterator) PageInfo() *iterator.PageInfo {
-	return it.pageInfo
-}
-
-// Next returns the next result. Its second return value is iterator.Done if there are no more
-// results. Once Next returns Done, all subsequent calls will return Done.
-func (it *RoomIterator) Next() (*genprotopb.Room, error) {
-	var item *genprotopb.Room
-	if err := it.nextFunc(); err != nil {
-		return item, err
-	}
-	item = it.items[0]
-	it.items = it.items[1:]
-	return item, nil
-}
-
-func (it *RoomIterator) bufLen() int {
-	return len(it.items)
-}
-
-func (it *RoomIterator) takeBuf() interface{} {
-	b := it.items
-	it.items = nil
-	return b
-}
diff --git a/client/messaging_client_example_test.go b/client/messaging_client_example_test.go
index 5cfb0b74d..9472c5a0e 100644
--- a/client/messaging_client_example_test.go
+++ b/client/messaging_client_example_test.go
@@ -62,7 +62,7 @@ func ExampleNewMessagingRESTClient() {
 	_ = c
 }
 
-func ExampleMessagingClient_CreateRoom() {
+func ExampleMessagingClient_Connect() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -74,20 +74,35 @@ func ExampleMessagingClient_CreateRoom() {
 		// TODO: Handle error.
 	}
 	defer c.Close()
-
-	req := &genprotopb.CreateRoomRequest{
-		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#CreateRoomRequest.
-	}
-	resp, err := c.CreateRoom(ctx, req)
+	stream, err := c.Connect(ctx)
 	if err != nil {
 		// TODO: Handle error.
 	}
-	// TODO: Use resp.
-	_ = resp
+	go func() {
+		reqs := []*genprotopb.ConnectRequest{
+			// TODO: Create requests.
+		}
+		for _, req := range reqs {
+			if err := stream.Send(req); err != nil {
+				// TODO: Handle error.
+			}
+		}
+		stream.CloseSend()
+	}()
+	for {
+		resp, err := stream.Recv()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			// TODO: handle error.
+		}
+		// TODO: Use resp.
+		_ = resp
+	}
 }
 
-func ExampleMessagingClient_GetRoom() {
+func ExampleMessagingClient_CreateBlurb() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -100,11 +115,11 @@ func ExampleMessagingClient_GetRoom() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.GetRoomRequest{
+	req := &genprotopb.CreateBlurbRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#GetRoomRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#CreateBlurbRequest.
 	}
-	resp, err := c.GetRoom(ctx, req)
+	resp, err := c.CreateBlurb(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
@@ -112,7 +127,7 @@ func ExampleMessagingClient_GetRoom() {
 	_ = resp
 }
 
-func ExampleMessagingClient_UpdateRoom() {
+func ExampleMessagingClient_CreateRoom() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -125,11 +140,11 @@ func ExampleMessagingClient_UpdateRoom() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.UpdateRoomRequest{
+	req := &genprotopb.CreateRoomRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#UpdateRoomRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#CreateRoomRequest.
 	}
-	resp, err := c.UpdateRoom(ctx, req)
+	resp, err := c.CreateRoom(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
@@ -137,7 +152,7 @@ func ExampleMessagingClient_UpdateRoom() {
 	_ = resp
 }
 
-func ExampleMessagingClient_DeleteRoom() {
+func ExampleMessagingClient_DeleteBlurb() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -150,48 +165,17 @@ func ExampleMessagingClient_DeleteRoom() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.DeleteRoomRequest{
+	req := &genprotopb.DeleteBlurbRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#DeleteRoomRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#DeleteBlurbRequest.
 	}
-	err = c.DeleteRoom(ctx, req)
+	err = c.DeleteBlurb(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
 }
 
-func ExampleMessagingClient_ListRooms() {
-	ctx := context.Background()
-	// This snippet has been automatically generated and should be regarded as a code template only.
-	// It will require modifications to work:
-	// - It may require correct/in-range values for request initialization.
-	// - It may require specifying regional endpoints when creating the service client as shown in:
-	//   https://pkg.go.dev/cloud.google.com/go#hdr-Client_Options
-	c, err := client.NewMessagingClient(ctx)
-	if err != nil {
-		// TODO: Handle error.
-	}
-	defer c.Close()
-
-	req := &genprotopb.ListRoomsRequest{
-		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#ListRoomsRequest.
-	}
-	it := c.ListRooms(ctx, req)
-	for {
-		resp, err := it.Next()
-		if err == iterator.Done {
-			break
-		}
-		if err != nil {
-			// TODO: Handle error.
-		}
-		// TODO: Use resp.
-		_ = resp
-	}
-}
-
-func ExampleMessagingClient_CreateBlurb() {
+func ExampleMessagingClient_DeleteRoom() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -204,16 +188,14 @@ func ExampleMessagingClient_CreateBlurb() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.CreateBlurbRequest{
+	req := &genprotopb.DeleteRoomRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#CreateBlurbRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#DeleteRoomRequest.
 	}
-	resp, err := c.CreateBlurb(ctx, req)
+	err = c.DeleteRoom(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
-	// TODO: Use resp.
-	_ = resp
 }
 
 func ExampleMessagingClient_GetBlurb() {
@@ -241,7 +223,7 @@ func ExampleMessagingClient_GetBlurb() {
 	_ = resp
 }
 
-func ExampleMessagingClient_UpdateBlurb() {
+func ExampleMessagingClient_GetRoom() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -254,11 +236,11 @@ func ExampleMessagingClient_UpdateBlurb() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.UpdateBlurbRequest{
+	req := &genprotopb.GetRoomRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#UpdateBlurbRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#GetRoomRequest.
 	}
-	resp, err := c.UpdateBlurb(ctx, req)
+	resp, err := c.GetRoom(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
@@ -266,7 +248,7 @@ func ExampleMessagingClient_UpdateBlurb() {
 	_ = resp
 }
 
-func ExampleMessagingClient_DeleteBlurb() {
+func ExampleMessagingClient_ListBlurbs() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -279,17 +261,25 @@ func ExampleMessagingClient_DeleteBlurb() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.DeleteBlurbRequest{
+	req := &genprotopb.ListBlurbsRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#DeleteBlurbRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#ListBlurbsRequest.
 	}
-	err = c.DeleteBlurb(ctx, req)
-	if err != nil {
-		// TODO: Handle error.
+	it := c.ListBlurbs(ctx, req)
+	for {
+		resp, err := it.Next()
+		if err == iterator.Done {
+			break
+		}
+		if err != nil {
+			// TODO: Handle error.
+		}
+		// TODO: Use resp.
+		_ = resp
 	}
 }
 
-func ExampleMessagingClient_ListBlurbs() {
+func ExampleMessagingClient_ListRooms() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -302,11 +292,11 @@ func ExampleMessagingClient_ListBlurbs() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.ListBlurbsRequest{
+	req := &genprotopb.ListRoomsRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#ListBlurbsRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#ListRoomsRequest.
 	}
-	it := c.ListBlurbs(ctx, req)
+	it := c.ListRooms(ctx, req)
 	for {
 		resp, err := it.Next()
 		if err == iterator.Done {
@@ -350,7 +340,7 @@ func ExampleMessagingClient_SearchBlurbs() {
 	_ = resp
 }
 
-func ExampleMessagingClient_Connect() {
+func ExampleMessagingClient_UpdateBlurb() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -362,32 +352,42 @@ func ExampleMessagingClient_Connect() {
 		// TODO: Handle error.
 	}
 	defer c.Close()
-	stream, err := c.Connect(ctx)
+
+	req := &genprotopb.UpdateBlurbRequest{
+		// TODO: Fill request struct fields.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#UpdateBlurbRequest.
+	}
+	resp, err := c.UpdateBlurb(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
-	go func() {
-		reqs := []*genprotopb.ConnectRequest{
-			// TODO: Create requests.
-		}
-		for _, req := range reqs {
-			if err := stream.Send(req); err != nil {
-				// TODO: Handle error.
-			}
-		}
-		stream.CloseSend()
-	}()
-	for {
-		resp, err := stream.Recv()
-		if err == io.EOF {
-			break
-		}
-		if err != nil {
-			// TODO: handle error.
-		}
-		// TODO: Use resp.
-		_ = resp
+	// TODO: Use resp.
+	_ = resp
+}
+
+func ExampleMessagingClient_UpdateRoom() {
+	ctx := context.Background()
+	// This snippet has been automatically generated and should be regarded as a code template only.
+	// It will require modifications to work:
+	// - It may require correct/in-range values for request initialization.
+	// - It may require specifying regional endpoints when creating the service client as shown in:
+	//   https://pkg.go.dev/cloud.google.com/go#hdr-Client_Options
+	c, err := client.NewMessagingClient(ctx)
+	if err != nil {
+		// TODO: Handle error.
 	}
+	defer c.Close()
+
+	req := &genprotopb.UpdateRoomRequest{
+		// TODO: Fill request struct fields.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#UpdateRoomRequest.
+	}
+	resp, err := c.UpdateRoom(ctx, req)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	// TODO: Use resp.
+	_ = resp
 }
 
 func ExampleMessagingClient_ListLocations() {
diff --git a/client/sequence_client_example_test.go b/client/sequence_client_example_test.go
index b5e985929..ba5635c48 100644
--- a/client/sequence_client_example_test.go
+++ b/client/sequence_client_example_test.go
@@ -61,7 +61,7 @@ func ExampleNewSequenceRESTClient() {
 	_ = c
 }
 
-func ExampleSequenceClient_CreateSequence() {
+func ExampleSequenceClient_AttemptSequence() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -74,19 +74,17 @@ func ExampleSequenceClient_CreateSequence() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.CreateSequenceRequest{
+	req := &genprotopb.AttemptSequenceRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#CreateSequenceRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#AttemptSequenceRequest.
 	}
-	resp, err := c.CreateSequence(ctx, req)
+	err = c.AttemptSequence(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
-	// TODO: Use resp.
-	_ = resp
 }
 
-func ExampleSequenceClient_CreateStreamingSequence() {
+func ExampleSequenceClient_CreateSequence() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -99,11 +97,11 @@ func ExampleSequenceClient_CreateStreamingSequence() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.CreateStreamingSequenceRequest{
+	req := &genprotopb.CreateSequenceRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#CreateStreamingSequenceRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#CreateSequenceRequest.
 	}
-	resp, err := c.CreateStreamingSequence(ctx, req)
+	resp, err := c.CreateSequence(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
@@ -111,7 +109,7 @@ func ExampleSequenceClient_CreateStreamingSequence() {
 	_ = resp
 }
 
-func ExampleSequenceClient_GetSequenceReport() {
+func ExampleSequenceClient_CreateStreamingSequence() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -124,11 +122,11 @@ func ExampleSequenceClient_GetSequenceReport() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.GetSequenceReportRequest{
+	req := &genprotopb.CreateStreamingSequenceRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#GetSequenceReportRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#CreateStreamingSequenceRequest.
 	}
-	resp, err := c.GetSequenceReport(ctx, req)
+	resp, err := c.CreateStreamingSequence(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
@@ -136,7 +134,7 @@ func ExampleSequenceClient_GetSequenceReport() {
 	_ = resp
 }
 
-func ExampleSequenceClient_GetStreamingSequenceReport() {
+func ExampleSequenceClient_GetSequenceReport() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -149,11 +147,11 @@ func ExampleSequenceClient_GetStreamingSequenceReport() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.GetStreamingSequenceReportRequest{
+	req := &genprotopb.GetSequenceReportRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#GetStreamingSequenceReportRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#GetSequenceReportRequest.
 	}
-	resp, err := c.GetStreamingSequenceReport(ctx, req)
+	resp, err := c.GetSequenceReport(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
@@ -161,7 +159,7 @@ func ExampleSequenceClient_GetStreamingSequenceReport() {
 	_ = resp
 }
 
-func ExampleSequenceClient_AttemptSequence() {
+func ExampleSequenceClient_GetStreamingSequenceReport() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -174,14 +172,16 @@ func ExampleSequenceClient_AttemptSequence() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.AttemptSequenceRequest{
+	req := &genprotopb.GetStreamingSequenceReportRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#AttemptSequenceRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#GetStreamingSequenceReportRequest.
 	}
-	err = c.AttemptSequence(ctx, req)
+	resp, err := c.GetStreamingSequenceReport(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
+	// TODO: Use resp.
+	_ = resp
 }
 
 func ExampleSequenceClient_ListLocations() {
diff --git a/client/testing_client.go b/client/testing_client.go
index 734c5dbd2..73854d629 100644
--- a/client/testing_client.go
+++ b/client/testing_client.go
@@ -1867,97 +1867,3 @@ func (c *testingRESTClient) CancelOperation(ctx context.Context, req *longrunnin
 		return googleapi.CheckResponse(httpRsp)
 	}, opts...)
 }
-
-// SessionIterator manages a stream of *genprotopb.Session.
-type SessionIterator struct {
-	items    []*genprotopb.Session
-	pageInfo *iterator.PageInfo
-	nextFunc func() error
-
-	// Response is the raw response for the current page.
-	// It must be cast to the RPC response type.
-	// Calling Next() or InternalFetch() updates this value.
-	Response interface{}
-
-	// InternalFetch is for use by the Google Cloud Libraries only.
-	// It is not part of the stable interface of this package.
-	//
-	// InternalFetch returns results from a single call to the underlying RPC.
-	// The number of results is no greater than pageSize.
-	// If there are no more results, nextPageToken is empty and err is nil.
-	InternalFetch func(pageSize int, pageToken string) (results []*genprotopb.Session, nextPageToken string, err error)
-}
-
-// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
-func (it *SessionIterator) PageInfo() *iterator.PageInfo {
-	return it.pageInfo
-}
-
-// Next returns the next result. Its second return value is iterator.Done if there are no more
-// results. Once Next returns Done, all subsequent calls will return Done.
-func (it *SessionIterator) Next() (*genprotopb.Session, error) {
-	var item *genprotopb.Session
-	if err := it.nextFunc(); err != nil {
-		return item, err
-	}
-	item = it.items[0]
-	it.items = it.items[1:]
-	return item, nil
-}
-
-func (it *SessionIterator) bufLen() int {
-	return len(it.items)
-}
-
-func (it *SessionIterator) takeBuf() interface{} {
-	b := it.items
-	it.items = nil
-	return b
-}
-
-// TestIterator manages a stream of *genprotopb.Test.
-type TestIterator struct {
-	items    []*genprotopb.Test
-	pageInfo *iterator.PageInfo
-	nextFunc func() error
-
-	// Response is the raw response for the current page.
-	// It must be cast to the RPC response type.
-	// Calling Next() or InternalFetch() updates this value.
-	Response interface{}
-
-	// InternalFetch is for use by the Google Cloud Libraries only.
-	// It is not part of the stable interface of this package.
-	//
-	// InternalFetch returns results from a single call to the underlying RPC.
-	// The number of results is no greater than pageSize.
-	// If there are no more results, nextPageToken is empty and err is nil.
-	InternalFetch func(pageSize int, pageToken string) (results []*genprotopb.Test, nextPageToken string, err error)
-}
-
-// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
-func (it *TestIterator) PageInfo() *iterator.PageInfo {
-	return it.pageInfo
-}
-
-// Next returns the next result. Its second return value is iterator.Done if there are no more
-// results. Once Next returns Done, all subsequent calls will return Done.
-func (it *TestIterator) Next() (*genprotopb.Test, error) {
-	var item *genprotopb.Test
-	if err := it.nextFunc(); err != nil {
-		return item, err
-	}
-	item = it.items[0]
-	it.items = it.items[1:]
-	return item, nil
-}
-
-func (it *TestIterator) bufLen() int {
-	return len(it.items)
-}
-
-func (it *TestIterator) takeBuf() interface{} {
-	b := it.items
-	it.items = nil
-	return b
-}
diff --git a/client/testing_client_example_test.go b/client/testing_client_example_test.go
index 2689510dc..733dfed48 100644
--- a/client/testing_client_example_test.go
+++ b/client/testing_client_example_test.go
@@ -86,7 +86,7 @@ func ExampleTestingClient_CreateSession() {
 	_ = resp
 }
 
-func ExampleTestingClient_GetSession() {
+func ExampleTestingClient_DeleteSession() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -99,19 +99,17 @@ func ExampleTestingClient_GetSession() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.GetSessionRequest{
+	req := &genprotopb.DeleteSessionRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#GetSessionRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#DeleteSessionRequest.
 	}
-	resp, err := c.GetSession(ctx, req)
+	err = c.DeleteSession(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
-	// TODO: Use resp.
-	_ = resp
 }
 
-func ExampleTestingClient_ListSessions() {
+func ExampleTestingClient_DeleteTest() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -124,25 +122,17 @@ func ExampleTestingClient_ListSessions() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.ListSessionsRequest{
+	req := &genprotopb.DeleteTestRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#ListSessionsRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#DeleteTestRequest.
 	}
-	it := c.ListSessions(ctx, req)
-	for {
-		resp, err := it.Next()
-		if err == iterator.Done {
-			break
-		}
-		if err != nil {
-			// TODO: Handle error.
-		}
-		// TODO: Use resp.
-		_ = resp
+	err = c.DeleteTest(ctx, req)
+	if err != nil {
+		// TODO: Handle error.
 	}
 }
 
-func ExampleTestingClient_DeleteSession() {
+func ExampleTestingClient_GetSession() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -155,17 +145,19 @@ func ExampleTestingClient_DeleteSession() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.DeleteSessionRequest{
+	req := &genprotopb.GetSessionRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#DeleteSessionRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#GetSessionRequest.
 	}
-	err = c.DeleteSession(ctx, req)
+	resp, err := c.GetSession(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
+	// TODO: Use resp.
+	_ = resp
 }
 
-func ExampleTestingClient_ReportSession() {
+func ExampleTestingClient_ListSessions() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -178,16 +170,22 @@ func ExampleTestingClient_ReportSession() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.ReportSessionRequest{
+	req := &genprotopb.ListSessionsRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#ReportSessionRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#ListSessionsRequest.
 	}
-	resp, err := c.ReportSession(ctx, req)
-	if err != nil {
-		// TODO: Handle error.
+	it := c.ListSessions(ctx, req)
+	for {
+		resp, err := it.Next()
+		if err == iterator.Done {
+			break
+		}
+		if err != nil {
+			// TODO: Handle error.
+		}
+		// TODO: Use resp.
+		_ = resp
 	}
-	// TODO: Use resp.
-	_ = resp
 }
 
 func ExampleTestingClient_ListTests() {
@@ -221,7 +219,7 @@ func ExampleTestingClient_ListTests() {
 	}
 }
 
-func ExampleTestingClient_DeleteTest() {
+func ExampleTestingClient_ReportSession() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
 	// It will require modifications to work:
@@ -234,14 +232,16 @@ func ExampleTestingClient_DeleteTest() {
 	}
 	defer c.Close()
 
-	req := &genprotopb.DeleteTestRequest{
+	req := &genprotopb.ReportSessionRequest{
 		// TODO: Fill request struct fields.
-		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#DeleteTestRequest.
+		// See https://pkg.go.dev/github.com/googleapis/gapic-showcase/server/genproto#ReportSessionRequest.
 	}
-	err = c.DeleteTest(ctx, req)
+	resp, err := c.ReportSession(ctx, req)
 	if err != nil {
 		// TODO: Handle error.
 	}
+	// TODO: Use resp.
+	_ = resp
 }
 
 func ExampleTestingClient_VerifyTest() {
diff --git a/cmd/gapic-showcase/echo-error-details.go b/cmd/gapic-showcase/echo-error-details.go
new file mode 100644
index 000000000..958316840
--- /dev/null
+++ b/cmd/gapic-showcase/echo-error-details.go
@@ -0,0 +1,75 @@
+// Code generated. DO NOT EDIT.
+
+package main
+
+import (
+	"github.com/spf13/cobra"
+
+	"fmt"
+
+	genprotopb "github.com/googleapis/gapic-showcase/server/genproto"
+
+	"github.com/golang/protobuf/jsonpb"
+
+	"os"
+)
+
+var EchoErrorDetailsInput genprotopb.EchoErrorDetailsRequest
+
+var EchoErrorDetailsFromFile string
+
+func init() {
+	EchoServiceCmd.AddCommand(EchoErrorDetailsCmd)
+
+	EchoErrorDetailsCmd.Flags().StringVar(&EchoErrorDetailsInput.SingleDetailText, "single_detail_text", "", "Content to return in a singular `*.error.details`...")
+
+	EchoErrorDetailsCmd.Flags().StringSliceVar(&EchoErrorDetailsInput.MultiDetailText, "multi_detail_text", []string{}, "Content to return in a repeated `*.error.details`...")
+
+	EchoErrorDetailsCmd.Flags().StringVar(&EchoErrorDetailsFromFile, "from_file", "", "Absolute path to JSON file containing request payload")
+
+}
+
+var EchoErrorDetailsCmd = &cobra.Command{
+	Use:   "echo-error-details",
+	Short: "This method returns error details in a repeated...",
+	Long:  "This method returns error details in a repeated 'google.protobuf.Any'  field. This method showcases handling errors thus encoded, particularly  over...",
+	PreRun: func(cmd *cobra.Command, args []string) {
+
+		if EchoErrorDetailsFromFile == "" {
+
+		}
+
+	},
+	RunE: func(cmd *cobra.Command, args []string) (err error) {
+
+		in := os.Stdin
+		if EchoErrorDetailsFromFile != "" {
+			in, err = os.Open(EchoErrorDetailsFromFile)
+			if err != nil {
+				return err
+			}
+			defer in.Close()
+
+			err = jsonpb.Unmarshal(in, &EchoErrorDetailsInput)
+			if err != nil {
+				return err
+			}
+
+		}
+
+		if Verbose {
+			printVerboseInput("Echo", "EchoErrorDetails", &EchoErrorDetailsInput)
+		}
+		resp, err := EchoClient.EchoErrorDetails(ctx, &EchoErrorDetailsInput)
+		if err != nil {
+			return err
+		}
+
+		if Verbose {
+			fmt.Print("Output: ")
+		}
+		printMessage(resp)
+
+		return err
+	},
+}
diff --git a/cmd/gapic-showcase/echo_service.go b/cmd/gapic-showcase/echo_service.go
index 638c8b563..020f33725 100644
--- a/cmd/gapic-showcase/echo_service.go
+++ b/cmd/gapic-showcase/echo_service.go
@@ -18,6 +18,7 @@ var EchoConfig *viper.Viper
 var EchoClient *gapic.EchoClient
 var EchoSubCommands []string = []string{
 	"echo",
+	"echo-error-details",
 	"expand",
 	"collect",
 	"chat",
diff --git a/server/genproto/echo.pb.go b/server/genproto/echo.pb.go
index 75acda158..674c79980 100644
--- a/server/genproto/echo.pb.go
+++ b/server/genproto/echo.pb.go
@@ -30,6 +30,7 @@ import (
 	status1 "google.golang.org/grpc/status"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	anypb "google.golang.org/protobuf/types/known/anypb"
 	durationpb "google.golang.org/protobuf/types/known/durationpb"
 	timestamppb "google.golang.org/protobuf/types/known/timestamppb"
 	reflect "reflect"
@@ -268,6 +269,216 @@ func (x *EchoResponse) GetSeverity() Severity {
 	return Severity_UNNECESSARY
 }
 
+// The request message used for the EchoErrorDetails method.
+type EchoErrorDetailsRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Content to return in a singular `*.error.details` field of type
+	// `google.protobuf.Any`
+	SingleDetailText string `protobuf:"bytes,1,opt,name=single_detail_text,json=singleDetailText,proto3" json:"single_detail_text,omitempty"`
+	// Content to return in a repeated `*.error.details` field of type
+	// `google.protobuf.Any`
+	MultiDetailText []string `protobuf:"bytes,2,rep,name=multi_detail_text,json=multiDetailText,proto3" json:"multi_detail_text,omitempty"`
+}
+
+func (x *EchoErrorDetailsRequest) Reset() {
+	*x = EchoErrorDetailsRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *EchoErrorDetailsRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*EchoErrorDetailsRequest) ProtoMessage() {}
+
+func (x *EchoErrorDetailsRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use EchoErrorDetailsRequest.ProtoReflect.Descriptor instead.
+func (*EchoErrorDetailsRequest) Descriptor() ([]byte, []int) {
+	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *EchoErrorDetailsRequest) GetSingleDetailText() string {
+	if x != nil {
+		return x.SingleDetailText
+	}
+	return ""
+}
+
+func (x *EchoErrorDetailsRequest) GetMultiDetailText() []string {
+	if x != nil {
+		return x.MultiDetailText
+	}
+	return nil
+}
+
+// The response message used for the EchoErrorDetails method.
+type EchoErrorDetailsResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	SingleDetail    *EchoErrorDetailsResponse_SingleDetail    `protobuf:"bytes,1,opt,name=single_detail,json=singleDetail,proto3" json:"single_detail,omitempty"`
+	MultipleDetails *EchoErrorDetailsResponse_MultipleDetails `protobuf:"bytes,2,opt,name=multiple_details,json=multipleDetails,proto3" json:"multiple_details,omitempty"`
+}
+
+func (x *EchoErrorDetailsResponse) Reset() {
+	*x = EchoErrorDetailsResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[3]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *EchoErrorDetailsResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*EchoErrorDetailsResponse) ProtoMessage() {}
+
+func (x *EchoErrorDetailsResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[3]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use EchoErrorDetailsResponse.ProtoReflect.Descriptor instead.
+func (*EchoErrorDetailsResponse) Descriptor() ([]byte, []int) {
+	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{3}
+}
+
+func (x *EchoErrorDetailsResponse) GetSingleDetail() *EchoErrorDetailsResponse_SingleDetail {
+	if x != nil {
+		return x.SingleDetail
+	}
+	return nil
+}
+
+func (x *EchoErrorDetailsResponse) GetMultipleDetails() *EchoErrorDetailsResponse_MultipleDetails {
+	if x != nil {
+		return x.MultipleDetails
+	}
+	return nil
+}
+
+type ErrorWithSingleDetail struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Details *anypb.Any `protobuf:"bytes,1,opt,name=details,proto3" json:"details,omitempty"`
+}
+
+func (x *ErrorWithSingleDetail) Reset() {
+	*x = ErrorWithSingleDetail{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[4]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ErrorWithSingleDetail) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ErrorWithSingleDetail) ProtoMessage() {}
+
+func (x *ErrorWithSingleDetail) ProtoReflect() protoreflect.Message {
+	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[4]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ErrorWithSingleDetail.ProtoReflect.Descriptor instead.
+func (*ErrorWithSingleDetail) Descriptor() ([]byte, []int) {
+	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{4}
+}
+
+func (x *ErrorWithSingleDetail) GetDetails() *anypb.Any {
+	if x != nil {
+		return x.Details
+	}
+	return nil
+}
+
+type ErrorWithMultipleDetails struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Details []*anypb.Any `protobuf:"bytes,1,rep,name=details,proto3" json:"details,omitempty"`
+}
+
+func (x *ErrorWithMultipleDetails) Reset() {
+	*x = ErrorWithMultipleDetails{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[5]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ErrorWithMultipleDetails) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ErrorWithMultipleDetails) ProtoMessage() {}
+
+func (x *ErrorWithMultipleDetails) ProtoReflect() protoreflect.Message {
+	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[5]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ErrorWithMultipleDetails.ProtoReflect.Descriptor instead.
+func (*ErrorWithMultipleDetails) Descriptor() ([]byte, []int) {
+	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{5}
+}
+
+func (x *ErrorWithMultipleDetails) GetDetails() []*anypb.Any {
+	if x != nil {
+		return x.Details
+	}
+	return nil
+}
+
 // The request message for the Expand method.
 type ExpandRequest struct {
 	state         protoimpl.MessageState
@@ -285,7 +496,7 @@ type ExpandRequest struct {
 func (x *ExpandRequest) Reset() {
 	*x = ExpandRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[2]
+		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[6]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -298,7 +509,7 @@ func (x *ExpandRequest) String() string {
 func (*ExpandRequest) ProtoMessage() {}
 
 func (x *ExpandRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[2]
+	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[6]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -311,7 +522,7 @@ func (x *ExpandRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ExpandRequest.ProtoReflect.Descriptor instead.
 func (*ExpandRequest) Descriptor() ([]byte, []int) {
-	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{2}
+	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{6}
 }
 
 func (x *ExpandRequest) GetContent() string {
@@ -352,7 +563,7 @@ type PagedExpandRequest struct {
 func (x *PagedExpandRequest) Reset() {
 	*x = PagedExpandRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[3]
+		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[7]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -365,7 +576,7 @@ func (x *PagedExpandRequest) String() string {
 func (*PagedExpandRequest) ProtoMessage() {}
 
 func (x *PagedExpandRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[3]
+	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[7]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -378,7 +589,7 @@ func (x *PagedExpandRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use PagedExpandRequest.ProtoReflect.Descriptor instead.
 func (*PagedExpandRequest) Descriptor() ([]byte, []int) {
-	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{3}
+	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{7}
 }
 
 func (x *PagedExpandRequest) GetContent() string {
@@ -424,7 +635,7 @@ type PagedExpandLegacyRequest struct {
 func (x *PagedExpandLegacyRequest) Reset() {
 	*x = PagedExpandLegacyRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[4]
+		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[8]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -437,7 +648,7 @@ func (x *PagedExpandLegacyRequest) String() string {
 func (*PagedExpandLegacyRequest) ProtoMessage() {}
 
 func (x *PagedExpandLegacyRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[4]
+	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[8]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -450,7 +661,7 @@ func (x *PagedExpandLegacyRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use PagedExpandLegacyRequest.ProtoReflect.Descriptor instead.
 func (*PagedExpandLegacyRequest) Descriptor() ([]byte, []int) {
-	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{4}
+	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{8}
 }
 
 func (x *PagedExpandLegacyRequest) GetContent() string {
@@ -489,7 +700,7 @@ type PagedExpandResponse struct {
 func (x *PagedExpandResponse) Reset() {
 	*x = PagedExpandResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[5]
+		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[9]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -502,7 +713,7 @@ func (x *PagedExpandResponse) String() string {
 func (*PagedExpandResponse) ProtoMessage() {}
 
 func (x *PagedExpandResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[5]
+	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[9]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -515,7 +726,7 @@ func (x *PagedExpandResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use PagedExpandResponse.ProtoReflect.Descriptor instead.
 func (*PagedExpandResponse) Descriptor() ([]byte, []int) {
-	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{5}
+	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{9}
 }
 
 func (x *PagedExpandResponse) GetResponses() []*EchoResponse {
@@ -544,7 +755,7 @@ type PagedExpandResponseList struct {
 func (x *PagedExpandResponseList) Reset() {
 	*x = PagedExpandResponseList{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[6]
+		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[10]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -557,7 +768,7 @@ func (x *PagedExpandResponseList) String() string {
 func (*PagedExpandResponseList) ProtoMessage() {}
 
 func (x *PagedExpandResponseList) ProtoReflect() protoreflect.Message {
-	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[6]
+	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[10]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -570,7 +781,7 @@ func (x *PagedExpandResponseList) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use PagedExpandResponseList.ProtoReflect.Descriptor instead.
 func (*PagedExpandResponseList) Descriptor() ([]byte, []int) {
-	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{6}
+	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{10}
 }
 
 func (x *PagedExpandResponseList) GetWords() []string {
@@ -597,7 +808,7 @@ type PagedExpandLegacyMappedResponse struct {
 func (x *PagedExpandLegacyMappedResponse) Reset() {
 	*x = PagedExpandLegacyMappedResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[7]
+		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[11]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -610,7 +821,7 @@ func (x *PagedExpandLegacyMappedResponse) String() string {
 func (*PagedExpandLegacyMappedResponse) ProtoMessage() {}
 
 func (x *PagedExpandLegacyMappedResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[7]
+	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[11]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -623,7 +834,7 @@ func (x *PagedExpandLegacyMappedResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use PagedExpandLegacyMappedResponse.ProtoReflect.Descriptor instead.
 func (*PagedExpandLegacyMappedResponse) Descriptor() ([]byte, []int) {
-	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{7}
+	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{11}
 }
 
 func (x *PagedExpandLegacyMappedResponse) GetAlphabetized() map[string]*PagedExpandResponseList {
@@ -661,7 +872,7 @@ type WaitRequest struct {
 func (x *WaitRequest) Reset() {
 	*x = WaitRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[8]
+		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[12]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -674,7 +885,7 @@ func (x *WaitRequest) String() string {
 func (*WaitRequest) ProtoMessage() {}
 
 func (x *WaitRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[8]
+	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[12]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -687,7 +898,7 @@ func (x *WaitRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use WaitRequest.ProtoReflect.Descriptor instead.
 func (*WaitRequest) Descriptor() ([]byte, []int) {
-	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{8}
+	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{12}
 }
 
 func (m *WaitRequest) GetEnd() isWaitRequest_End {
@@ -782,7 +993,7 @@ type WaitResponse struct {
 func (x *WaitResponse) Reset() {
 	*x = WaitResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[9]
+		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[13]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -795,7 +1006,7 @@ func (x *WaitResponse) String() string {
 func (*WaitResponse) ProtoMessage() {}
 
 func (x *WaitResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[9]
+	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[13]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -808,7 +1019,7 @@ func (x *WaitResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use WaitResponse.ProtoReflect.Descriptor instead.
 func (*WaitResponse) Descriptor() ([]byte, []int) {
-	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{9}
+	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{13}
 }
 
 func (x *WaitResponse) GetContent() string {
@@ -831,7 +1042,7 @@ type WaitMetadata struct {
 func (x *WaitMetadata) Reset() {
 	*x = WaitMetadata{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[10]
+		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[14]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -844,7 +1055,7 @@ func (x *WaitMetadata) String() string {
 func (*WaitMetadata) ProtoMessage() {}
 
 func (x *WaitMetadata) ProtoReflect() protoreflect.Message {
-	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[10]
+	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[14]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -857,7 +1068,7 @@ func (x *WaitMetadata) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use WaitMetadata.ProtoReflect.Descriptor instead.
 func (*WaitMetadata) Descriptor() ([]byte, []int) {
-	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{10}
+	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{14}
 }
 
 func (x *WaitMetadata) GetEndTime() *timestamppb.Timestamp {
@@ -885,7 +1096,7 @@ type BlockRequest struct {
 func (x *BlockRequest) Reset() {
 	*x = BlockRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[11]
+		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[15]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -898,7 +1109,7 @@ func (x *BlockRequest) String() string {
 func (*BlockRequest) ProtoMessage() {}
 
 func (x *BlockRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[11]
+	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[15]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -911,7 +1122,7 @@ func (x *BlockRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use BlockRequest.ProtoReflect.Descriptor instead.
 func (*BlockRequest) Descriptor() ([]byte, []int) {
-	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{11}
+	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{15}
 }
 
 func (x *BlockRequest) GetResponseDelay() *durationpb.Duration {
@@ -975,7 +1186,7 @@ type BlockResponse struct {
 func (x *BlockResponse) Reset() {
 	*x = BlockResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[12]
+		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[16]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -988,7 +1199,7 @@ func (x *BlockResponse) String() string {
 func (*BlockResponse) ProtoMessage() {}
 
 func (x *BlockResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[12]
+	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[16]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1001,7 +1212,7 @@ func (x *BlockResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use BlockResponse.ProtoReflect.Descriptor instead.
 func (*BlockResponse) Descriptor() ([]byte, []int) {
-	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{12}
+	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{16}
 }
 
 func (x *BlockResponse) GetContent() string {
@@ -1011,6 +1222,100 @@ func (x *BlockResponse) GetContent() string {
 	return ""
 }
 
+type EchoErrorDetailsResponse_SingleDetail struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Error *ErrorWithSingleDetail `protobuf:"bytes,1,opt,name=error,proto3" json:"error,omitempty"`
+}
+
+func (x *EchoErrorDetailsResponse_SingleDetail) Reset() {
+	*x = EchoErrorDetailsResponse_SingleDetail{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[17]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *EchoErrorDetailsResponse_SingleDetail) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*EchoErrorDetailsResponse_SingleDetail) ProtoMessage() {}
+
+func (x *EchoErrorDetailsResponse_SingleDetail) ProtoReflect() protoreflect.Message {
+	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[17]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use EchoErrorDetailsResponse_SingleDetail.ProtoReflect.Descriptor instead.
+func (*EchoErrorDetailsResponse_SingleDetail) Descriptor() ([]byte, []int) {
+	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{3, 0}
+}
+
+func (x *EchoErrorDetailsResponse_SingleDetail) GetError() *ErrorWithSingleDetail {
+	if x != nil {
+		return x.Error
+	}
+	return nil
+}
+
+type EchoErrorDetailsResponse_MultipleDetails struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Error *ErrorWithMultipleDetails `protobuf:"bytes,1,opt,name=error,proto3" json:"error,omitempty"`
+}
+
+func (x *EchoErrorDetailsResponse_MultipleDetails) Reset() {
+	*x = EchoErrorDetailsResponse_MultipleDetails{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[18]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *EchoErrorDetailsResponse_MultipleDetails) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*EchoErrorDetailsResponse_MultipleDetails) ProtoMessage() {}
+
+func (x *EchoErrorDetailsResponse_MultipleDetails) ProtoReflect() protoreflect.Message {
+	mi := &file_google_showcase_v1beta1_echo_proto_msgTypes[18]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use EchoErrorDetailsResponse_MultipleDetails.ProtoReflect.Descriptor instead.
+func (*EchoErrorDetailsResponse_MultipleDetails) Descriptor() ([]byte, []int) {
+	return file_google_showcase_v1beta1_echo_proto_rawDescGZIP(), []int{3, 1}
+}
+
+func (x *EchoErrorDetailsResponse_MultipleDetails) GetError() *ErrorWithMultipleDetails {
+	if x != nil {
+		return x.Error
+	}
+	return nil
+}
+
 var File_google_showcase_v1beta1_echo_proto protoreflect.FileDescriptor
 
 var file_google_showcase_v1beta1_echo_proto_rawDesc = []byte{
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 }
 
 var (
@@ -1270,68 +1630,83 @@ func file_google_showcase_v1beta1_echo_proto_rawDescGZIP() []byte {
 }
 
 var file_google_showcase_v1beta1_echo_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_google_showcase_v1beta1_echo_proto_msgTypes = make([]protoimpl.MessageInfo, 14)
+var file_google_showcase_v1beta1_echo_proto_msgTypes = make([]protoimpl.MessageInfo, 20)
 var file_google_showcase_v1beta1_echo_proto_goTypes = []interface{}{
-	(Severity)(0),                           // 0: google.showcase.v1beta1.Severity
-	(*EchoRequest)(nil),                     // 1: google.showcase.v1beta1.EchoRequest
-	(*EchoResponse)(nil),                    // 2: google.showcase.v1beta1.EchoResponse
-	(*ExpandRequest)(nil),                   // 3: google.showcase.v1beta1.ExpandRequest
-	(*PagedExpandRequest)(nil),              // 4: google.showcase.v1beta1.PagedExpandRequest
-	(*PagedExpandLegacyRequest)(nil),        // 5: google.showcase.v1beta1.PagedExpandLegacyRequest
-	(*PagedExpandResponse)(nil),             // 6: google.showcase.v1beta1.PagedExpandResponse
-	(*PagedExpandResponseList)(nil),         // 7: google.showcase.v1beta1.PagedExpandResponseList
-	(*PagedExpandLegacyMappedResponse)(nil), // 8: google.showcase.v1beta1.PagedExpandLegacyMappedResponse
-	(*WaitRequest)(nil),                     // 9: google.showcase.v1beta1.WaitRequest
-	(*WaitResponse)(nil),                    // 10: google.showcase.v1beta1.WaitResponse
-	(*WaitMetadata)(nil),                    // 11: google.showcase.v1beta1.WaitMetadata
-	(*BlockRequest)(nil),                    // 12: google.showcase.v1beta1.BlockRequest
-	(*BlockResponse)(nil),                   // 13: google.showcase.v1beta1.BlockResponse
-	nil,                                     // 14: google.showcase.v1beta1.PagedExpandLegacyMappedResponse.AlphabetizedEntry
-	(*status.Status)(nil),                   // 15: google.rpc.Status
-	(*durationpb.Duration)(nil),             // 16: google.protobuf.Duration
-	(*timestamppb.Timestamp)(nil),           // 17: google.protobuf.Timestamp
-	(*longrunning.Operation)(nil),           // 18: google.longrunning.Operation
+	(Severity)(0),                                    // 0: google.showcase.v1beta1.Severity
+	(*EchoRequest)(nil),                              // 1: google.showcase.v1beta1.EchoRequest
+	(*EchoResponse)(nil),                             // 2: google.showcase.v1beta1.EchoResponse
+	(*EchoErrorDetailsRequest)(nil),                  // 3: google.showcase.v1beta1.EchoErrorDetailsRequest
+	(*EchoErrorDetailsResponse)(nil),                 // 4: google.showcase.v1beta1.EchoErrorDetailsResponse
+	(*ErrorWithSingleDetail)(nil),                    // 5: google.showcase.v1beta1.ErrorWithSingleDetail
+	(*ErrorWithMultipleDetails)(nil),                 // 6: google.showcase.v1beta1.ErrorWithMultipleDetails
+	(*ExpandRequest)(nil),                            // 7: google.showcase.v1beta1.ExpandRequest
+	(*PagedExpandRequest)(nil),                       // 8: google.showcase.v1beta1.PagedExpandRequest
+	(*PagedExpandLegacyRequest)(nil),                 // 9: google.showcase.v1beta1.PagedExpandLegacyRequest
+	(*PagedExpandResponse)(nil),                      // 10: google.showcase.v1beta1.PagedExpandResponse
+	(*PagedExpandResponseList)(nil),                  // 11: google.showcase.v1beta1.PagedExpandResponseList
+	(*PagedExpandLegacyMappedResponse)(nil),          // 12: google.showcase.v1beta1.PagedExpandLegacyMappedResponse
+	(*WaitRequest)(nil),                              // 13: google.showcase.v1beta1.WaitRequest
+	(*WaitResponse)(nil),                             // 14: google.showcase.v1beta1.WaitResponse
+	(*WaitMetadata)(nil),                             // 15: google.showcase.v1beta1.WaitMetadata
+	(*BlockRequest)(nil),                             // 16: google.showcase.v1beta1.BlockRequest
+	(*BlockResponse)(nil),                            // 17: google.showcase.v1beta1.BlockResponse
+	(*EchoErrorDetailsResponse_SingleDetail)(nil),    // 18: google.showcase.v1beta1.EchoErrorDetailsResponse.SingleDetail
+	(*EchoErrorDetailsResponse_MultipleDetails)(nil), // 19: google.showcase.v1beta1.EchoErrorDetailsResponse.MultipleDetails
+	nil,                           // 20: google.showcase.v1beta1.PagedExpandLegacyMappedResponse.AlphabetizedEntry
+	(*status.Status)(nil),         // 21: google.rpc.Status
+	(*anypb.Any)(nil),             // 22: google.protobuf.Any
+	(*durationpb.Duration)(nil),   // 23: google.protobuf.Duration
+	(*timestamppb.Timestamp)(nil), // 24: google.protobuf.Timestamp
+	(*longrunning.Operation)(nil), // 25: google.longrunning.Operation
 }
 var file_google_showcase_v1beta1_echo_proto_depIdxs = []int32{
-	15, // 0: google.showcase.v1beta1.EchoRequest.error:type_name -> google.rpc.Status
+	21, // 0: google.showcase.v1beta1.EchoRequest.error:type_name -> google.rpc.Status
 	0,  // 1: google.showcase.v1beta1.EchoRequest.severity:type_name -> google.showcase.v1beta1.Severity
 	0,  // 2: google.showcase.v1beta1.EchoResponse.severity:type_name -> google.showcase.v1beta1.Severity
-	15, // 3: google.showcase.v1beta1.ExpandRequest.error:type_name -> google.rpc.Status
-	16, // 4: google.showcase.v1beta1.ExpandRequest.stream_wait_time:type_name -> google.protobuf.Duration
-	2,  // 5: google.showcase.v1beta1.PagedExpandResponse.responses:type_name -> google.showcase.v1beta1.EchoResponse
-	14, // 6: google.showcase.v1beta1.PagedExpandLegacyMappedResponse.alphabetized:type_name -> google.showcase.v1beta1.PagedExpandLegacyMappedResponse.AlphabetizedEntry
-	17, // 7: google.showcase.v1beta1.WaitRequest.end_time:type_name -> google.protobuf.Timestamp
-	16, // 8: google.showcase.v1beta1.WaitRequest.ttl:type_name -> google.protobuf.Duration
-	15, // 9: google.showcase.v1beta1.WaitRequest.error:type_name -> google.rpc.Status
-	10, // 10: google.showcase.v1beta1.WaitRequest.success:type_name -> google.showcase.v1beta1.WaitResponse
-	17, // 11: google.showcase.v1beta1.WaitMetadata.end_time:type_name -> google.protobuf.Timestamp
-	16, // 12: google.showcase.v1beta1.BlockRequest.response_delay:type_name -> google.protobuf.Duration
-	15, // 13: google.showcase.v1beta1.BlockRequest.error:type_name -> google.rpc.Status
-	13, // 14: google.showcase.v1beta1.BlockRequest.success:type_name -> google.showcase.v1beta1.BlockResponse
-	7,  // 15: google.showcase.v1beta1.PagedExpandLegacyMappedResponse.AlphabetizedEntry.value:type_name -> google.showcase.v1beta1.PagedExpandResponseList
-	1,  // 16: google.showcase.v1beta1.Echo.Echo:input_type -> google.showcase.v1beta1.EchoRequest
-	3,  // 17: google.showcase.v1beta1.Echo.Expand:input_type -> google.showcase.v1beta1.ExpandRequest
-	1,  // 18: google.showcase.v1beta1.Echo.Collect:input_type -> google.showcase.v1beta1.EchoRequest
-	1,  // 19: google.showcase.v1beta1.Echo.Chat:input_type -> google.showcase.v1beta1.EchoRequest
-	4,  // 20: google.showcase.v1beta1.Echo.PagedExpand:input_type -> google.showcase.v1beta1.PagedExpandRequest
-	5,  // 21: google.showcase.v1beta1.Echo.PagedExpandLegacy:input_type -> google.showcase.v1beta1.PagedExpandLegacyRequest
-	4,  // 22: google.showcase.v1beta1.Echo.PagedExpandLegacyMapped:input_type -> google.showcase.v1beta1.PagedExpandRequest
-	9,  // 23: google.showcase.v1beta1.Echo.Wait:input_type -> google.showcase.v1beta1.WaitRequest
-	12, // 24: google.showcase.v1beta1.Echo.Block:input_type -> google.showcase.v1beta1.BlockRequest
-	2,  // 25: google.showcase.v1beta1.Echo.Echo:output_type -> google.showcase.v1beta1.EchoResponse
-	2,  // 26: google.showcase.v1beta1.Echo.Expand:output_type -> google.showcase.v1beta1.EchoResponse
-	2,  // 27: google.showcase.v1beta1.Echo.Collect:output_type -> google.showcase.v1beta1.EchoResponse
-	2,  // 28: google.showcase.v1beta1.Echo.Chat:output_type -> google.showcase.v1beta1.EchoResponse
-	6,  // 29: google.showcase.v1beta1.Echo.PagedExpand:output_type -> google.showcase.v1beta1.PagedExpandResponse
-	6,  // 30: google.showcase.v1beta1.Echo.PagedExpandLegacy:output_type -> google.showcase.v1beta1.PagedExpandResponse
-	8,  // 31: google.showcase.v1beta1.Echo.PagedExpandLegacyMapped:output_type -> google.showcase.v1beta1.PagedExpandLegacyMappedResponse
-	18, // 32: google.showcase.v1beta1.Echo.Wait:output_type -> google.longrunning.Operation
-	13, // 33: google.showcase.v1beta1.Echo.Block:output_type -> google.showcase.v1beta1.BlockResponse
-	25, // [25:34] is the sub-list for method output_type
-	16, // [16:25] is the sub-list for method input_type
-	16, // [16:16] is the sub-list for extension type_name
-	16, // [16:16] is the sub-list for extension extendee
-	0,  // [0:16] is the sub-list for field type_name
+	18, // 3: google.showcase.v1beta1.EchoErrorDetailsResponse.single_detail:type_name -> google.showcase.v1beta1.EchoErrorDetailsResponse.SingleDetail
+	19, // 4: google.showcase.v1beta1.EchoErrorDetailsResponse.multiple_details:type_name -> google.showcase.v1beta1.EchoErrorDetailsResponse.MultipleDetails
+	22, // 5: google.showcase.v1beta1.ErrorWithSingleDetail.details:type_name -> google.protobuf.Any
+	22, // 6: google.showcase.v1beta1.ErrorWithMultipleDetails.details:type_name -> google.protobuf.Any
+	21, // 7: google.showcase.v1beta1.ExpandRequest.error:type_name -> google.rpc.Status
+	23, // 8: google.showcase.v1beta1.ExpandRequest.stream_wait_time:type_name -> google.protobuf.Duration
+	2,  // 9: google.showcase.v1beta1.PagedExpandResponse.responses:type_name -> google.showcase.v1beta1.EchoResponse
+	20, // 10: google.showcase.v1beta1.PagedExpandLegacyMappedResponse.alphabetized:type_name -> google.showcase.v1beta1.PagedExpandLegacyMappedResponse.AlphabetizedEntry
+	24, // 11: google.showcase.v1beta1.WaitRequest.end_time:type_name -> google.protobuf.Timestamp
+	23, // 12: google.showcase.v1beta1.WaitRequest.ttl:type_name -> google.protobuf.Duration
+	21, // 13: google.showcase.v1beta1.WaitRequest.error:type_name -> google.rpc.Status
+	14, // 14: google.showcase.v1beta1.WaitRequest.success:type_name -> google.showcase.v1beta1.WaitResponse
+	24, // 15: google.showcase.v1beta1.WaitMetadata.end_time:type_name -> google.protobuf.Timestamp
+	23, // 16: google.showcase.v1beta1.BlockRequest.response_delay:type_name -> google.protobuf.Duration
+	21, // 17: google.showcase.v1beta1.BlockRequest.error:type_name -> google.rpc.Status
+	17, // 18: google.showcase.v1beta1.BlockRequest.success:type_name -> google.showcase.v1beta1.BlockResponse
+	5,  // 19: google.showcase.v1beta1.EchoErrorDetailsResponse.SingleDetail.error:type_name -> google.showcase.v1beta1.ErrorWithSingleDetail
+	6,  // 20: google.showcase.v1beta1.EchoErrorDetailsResponse.MultipleDetails.error:type_name -> google.showcase.v1beta1.ErrorWithMultipleDetails
+	11, // 21: google.showcase.v1beta1.PagedExpandLegacyMappedResponse.AlphabetizedEntry.value:type_name -> google.showcase.v1beta1.PagedExpandResponseList
+	1,  // 22: google.showcase.v1beta1.Echo.Echo:input_type -> google.showcase.v1beta1.EchoRequest
+	3,  // 23: google.showcase.v1beta1.Echo.EchoErrorDetails:input_type -> google.showcase.v1beta1.EchoErrorDetailsRequest
+	7,  // 24: google.showcase.v1beta1.Echo.Expand:input_type -> google.showcase.v1beta1.ExpandRequest
+	1,  // 25: google.showcase.v1beta1.Echo.Collect:input_type -> google.showcase.v1beta1.EchoRequest
+	1,  // 26: google.showcase.v1beta1.Echo.Chat:input_type -> google.showcase.v1beta1.EchoRequest
+	8,  // 27: google.showcase.v1beta1.Echo.PagedExpand:input_type -> google.showcase.v1beta1.PagedExpandRequest
+	9,  // 28: google.showcase.v1beta1.Echo.PagedExpandLegacy:input_type -> google.showcase.v1beta1.PagedExpandLegacyRequest
+	8,  // 29: google.showcase.v1beta1.Echo.PagedExpandLegacyMapped:input_type -> google.showcase.v1beta1.PagedExpandRequest
+	13, // 30: google.showcase.v1beta1.Echo.Wait:input_type -> google.showcase.v1beta1.WaitRequest
+	16, // 31: google.showcase.v1beta1.Echo.Block:input_type -> google.showcase.v1beta1.BlockRequest
+	2,  // 32: google.showcase.v1beta1.Echo.Echo:output_type -> google.showcase.v1beta1.EchoResponse
+	4,  // 33: google.showcase.v1beta1.Echo.EchoErrorDetails:output_type -> google.showcase.v1beta1.EchoErrorDetailsResponse
+	2,  // 34: google.showcase.v1beta1.Echo.Expand:output_type -> google.showcase.v1beta1.EchoResponse
+	2,  // 35: google.showcase.v1beta1.Echo.Collect:output_type -> google.showcase.v1beta1.EchoResponse
+	2,  // 36: google.showcase.v1beta1.Echo.Chat:output_type -> google.showcase.v1beta1.EchoResponse
+	10, // 37: google.showcase.v1beta1.Echo.PagedExpand:output_type -> google.showcase.v1beta1.PagedExpandResponse
+	10, // 38: google.showcase.v1beta1.Echo.PagedExpandLegacy:output_type -> google.showcase.v1beta1.PagedExpandResponse
+	12, // 39: google.showcase.v1beta1.Echo.PagedExpandLegacyMapped:output_type -> google.showcase.v1beta1.PagedExpandLegacyMappedResponse
+	25, // 40: google.showcase.v1beta1.Echo.Wait:output_type -> google.longrunning.Operation
+	17, // 41: google.showcase.v1beta1.Echo.Block:output_type -> google.showcase.v1beta1.BlockResponse
+	32, // [32:42] is the sub-list for method output_type
+	22, // [22:32] is the sub-list for method input_type
+	22, // [22:22] is the sub-list for extension type_name
+	22, // [22:22] is the sub-list for extension extendee
+	0,  // [0:22] is the sub-list for field type_name
 }
 
 func init() { file_google_showcase_v1beta1_echo_proto_init() }
@@ -1365,7 +1740,7 @@ func file_google_showcase_v1beta1_echo_proto_init() {
 			}
 		}
 		file_google_showcase_v1beta1_echo_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ExpandRequest); i {
+			switch v := v.(*EchoErrorDetailsRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1377,7 +1752,7 @@ func file_google_showcase_v1beta1_echo_proto_init() {
 			}
 		}
 		file_google_showcase_v1beta1_echo_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*PagedExpandRequest); i {
+			switch v := v.(*EchoErrorDetailsResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1389,7 +1764,7 @@ func file_google_showcase_v1beta1_echo_proto_init() {
 			}
 		}
 		file_google_showcase_v1beta1_echo_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*PagedExpandLegacyRequest); i {
+			switch v := v.(*ErrorWithSingleDetail); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1401,7 +1776,7 @@ func file_google_showcase_v1beta1_echo_proto_init() {
 			}
 		}
 		file_google_showcase_v1beta1_echo_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*PagedExpandResponse); i {
+			switch v := v.(*ErrorWithMultipleDetails); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1413,7 +1788,7 @@ func file_google_showcase_v1beta1_echo_proto_init() {
 			}
 		}
 		file_google_showcase_v1beta1_echo_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*PagedExpandResponseList); i {
+			switch v := v.(*ExpandRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1425,7 +1800,7 @@ func file_google_showcase_v1beta1_echo_proto_init() {
 			}
 		}
 		file_google_showcase_v1beta1_echo_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*PagedExpandLegacyMappedResponse); i {
+			switch v := v.(*PagedExpandRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1437,7 +1812,7 @@ func file_google_showcase_v1beta1_echo_proto_init() {
 			}
 		}
 		file_google_showcase_v1beta1_echo_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*WaitRequest); i {
+			switch v := v.(*PagedExpandLegacyRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1449,7 +1824,7 @@ func file_google_showcase_v1beta1_echo_proto_init() {
 			}
 		}
 		file_google_showcase_v1beta1_echo_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*WaitResponse); i {
+			switch v := v.(*PagedExpandResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1461,7 +1836,7 @@ func file_google_showcase_v1beta1_echo_proto_init() {
 			}
 		}
 		file_google_showcase_v1beta1_echo_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*WaitMetadata); i {
+			switch v := v.(*PagedExpandResponseList); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1473,7 +1848,7 @@ func file_google_showcase_v1beta1_echo_proto_init() {
 			}
 		}
 		file_google_showcase_v1beta1_echo_proto_msgTypes[11].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*BlockRequest); i {
+			switch v := v.(*PagedExpandLegacyMappedResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1485,6 +1860,54 @@ func file_google_showcase_v1beta1_echo_proto_init() {
 			}
 		}
 		file_google_showcase_v1beta1_echo_proto_msgTypes[12].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*WaitRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_showcase_v1beta1_echo_proto_msgTypes[13].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*WaitResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_showcase_v1beta1_echo_proto_msgTypes[14].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*WaitMetadata); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_showcase_v1beta1_echo_proto_msgTypes[15].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*BlockRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_showcase_v1beta1_echo_proto_msgTypes[16].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*BlockResponse); i {
 			case 0:
 				return &v.state
@@ -1496,18 +1919,42 @@ func file_google_showcase_v1beta1_echo_proto_init() {
 				return nil
 			}
 		}
+		file_google_showcase_v1beta1_echo_proto_msgTypes[17].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*EchoErrorDetailsResponse_SingleDetail); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_showcase_v1beta1_echo_proto_msgTypes[18].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*EchoErrorDetailsResponse_MultipleDetails); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
 	file_google_showcase_v1beta1_echo_proto_msgTypes[0].OneofWrappers = []interface{}{
 		(*EchoRequest_Content)(nil),
 		(*EchoRequest_Error)(nil),
 	}
-	file_google_showcase_v1beta1_echo_proto_msgTypes[8].OneofWrappers = []interface{}{
+	file_google_showcase_v1beta1_echo_proto_msgTypes[12].OneofWrappers = []interface{}{
 		(*WaitRequest_EndTime)(nil),
 		(*WaitRequest_Ttl)(nil),
 		(*WaitRequest_Error)(nil),
 		(*WaitRequest_Success)(nil),
 	}
-	file_google_showcase_v1beta1_echo_proto_msgTypes[11].OneofWrappers = []interface{}{
+	file_google_showcase_v1beta1_echo_proto_msgTypes[15].OneofWrappers = []interface{}{
 		(*BlockRequest_Error)(nil),
 		(*BlockRequest_Success)(nil),
 	}
@@ -1517,7 +1964,7 @@ func file_google_showcase_v1beta1_echo_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_google_showcase_v1beta1_echo_proto_rawDesc,
 			NumEnums:      1,
-			NumMessages:   14,
+			NumMessages:   20,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
@@ -1546,6 +1993,13 @@ const _ = grpc.SupportPackageIsVersion6
 type EchoClient interface {
 	// This method simply echoes the request. This method showcases unary RPCs.
 	Echo(ctx context.Context, in *EchoRequest, opts ...grpc.CallOption) (*EchoResponse, error)
+	// This method returns error details in a repeated "google.protobuf.Any"
+	// field. This method showcases handling errors thus encoded, particularly
+	// over REST transport. Note that GAPICs only allow the type
+	// "google.protobuf.Any" for field paths ending in "error.details", and, at
+	// run-time, the actual types for these fields must be one of the types in
+	// google/rpc/error_details.proto.
+	EchoErrorDetails(ctx context.Context, in *EchoErrorDetailsRequest, opts ...grpc.CallOption) (*EchoErrorDetailsResponse, error)
 	// This method splits the given content into words and will pass each word back
 	// through the stream. This method showcases server-side streaming RPCs.
 	Expand(ctx context.Context, in *ExpandRequest, opts ...grpc.CallOption) (Echo_ExpandClient, error)
@@ -1596,6 +2050,15 @@ func (c *echoClient) Echo(ctx context.Context, in *EchoRequest, opts ...grpc.Cal
 	return out, nil
 }
 
+func (c *echoClient) EchoErrorDetails(ctx context.Context, in *EchoErrorDetailsRequest, opts ...grpc.CallOption) (*EchoErrorDetailsResponse, error) {
+	out := new(EchoErrorDetailsResponse)
+	err := c.cc.Invoke(ctx, "/google.showcase.v1beta1.Echo/EchoErrorDetails", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *echoClient) Expand(ctx context.Context, in *ExpandRequest, opts ...grpc.CallOption) (Echo_ExpandClient, error) {
 	stream, err := c.cc.NewStream(ctx, &_Echo_serviceDesc.Streams[0], "/google.showcase.v1beta1.Echo/Expand", opts...)
 	if err != nil {
@@ -1742,6 +2205,13 @@ func (c *echoClient) Block(ctx context.Context, in *BlockRequest, opts ...grpc.C
 type EchoServer interface {
 	// This method simply echoes the request. This method showcases unary RPCs.
 	Echo(context.Context, *EchoRequest) (*EchoResponse, error)
+	// This method returns error details in a repeated "google.protobuf.Any"
+	// field. This method showcases handling errors thus encoded, particularly
+	// over REST transport. Note that GAPICs only allow the type
+	// "google.protobuf.Any" for field paths ending in "error.details", and, at
+	// run-time, the actual types for these fields must be one of the types in
+	// google/rpc/error_details.proto.
+	EchoErrorDetails(context.Context, *EchoErrorDetailsRequest) (*EchoErrorDetailsResponse, error)
 	// This method splits the given content into words and will pass each word back
 	// through the stream. This method showcases server-side streaming RPCs.
 	Expand(*ExpandRequest, Echo_ExpandServer) error
@@ -1782,6 +2252,9 @@ type UnimplementedEchoServer struct {
 func (*UnimplementedEchoServer) Echo(context.Context, *EchoRequest) (*EchoResponse, error) {
 	return nil, status1.Errorf(codes.Unimplemented, "method Echo not implemented")
 }
+func (*UnimplementedEchoServer) EchoErrorDetails(context.Context, *EchoErrorDetailsRequest) (*EchoErrorDetailsResponse, error) {
+	return nil, status1.Errorf(codes.Unimplemented, "method EchoErrorDetails not implemented")
+}
 func (*UnimplementedEchoServer) Expand(*ExpandRequest, Echo_ExpandServer) error {
 	return status1.Errorf(codes.Unimplemented, "method Expand not implemented")
 }
@@ -1829,6 +2302,24 @@ func _Echo_Echo_Handler(srv interface{}, ctx context.Context, dec func(interface
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Echo_EchoErrorDetails_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(EchoErrorDetailsRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(EchoServer).EchoErrorDetails(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/google.showcase.v1beta1.Echo/EchoErrorDetails",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(EchoServer).EchoErrorDetails(ctx, req.(*EchoErrorDetailsRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _Echo_Expand_Handler(srv interface{}, stream grpc.ServerStream) error {
 	m := new(ExpandRequest)
 	if err := stream.RecvMsg(m); err != nil {
@@ -2000,6 +2491,10 @@ var _Echo_serviceDesc = grpc.ServiceDesc{
 			MethodName: "Echo",
 			Handler:    _Echo_Echo_Handler,
 		},
+		{
+			MethodName: "EchoErrorDetails",
+			Handler:    _Echo_EchoErrorDetails_Handler,
+		},
 		{
 			MethodName: "PagedExpand",
 			Handler:    _Echo_PagedExpand_Handler,
diff --git a/server/genrest/echo.go b/server/genrest/echo.go
index 7f23dc871..4f8429fa5 100644
--- a/server/genrest/echo.go
+++ b/server/genrest/echo.go
@@ -98,6 +98,77 @@ func (backend *RESTBackend) HandleEcho(w http.ResponseWriter, r *http.Request) {
 	w.Write(json)
 }
 
+// HandleEchoErrorDetails translates REST requests/responses on the wire to internal proto messages for EchoErrorDetails
+//
+//	Generated for HTTP binding pattern: POST "/v1beta1/echo:error-details"
+func (backend *RESTBackend) HandleEchoErrorDetails(w http.ResponseWriter, r *http.Request) {
+	urlPathParams := gmux.Vars(r)
+	numUrlPathParams := len(urlPathParams)
+
+	backend.StdLog.Printf("Received %s request matching '/v1beta1/echo:error-details': %q", r.Method, r.URL)
+	backend.StdLog.Printf("  urlPathParams (expect 0, have %d): %q", numUrlPathParams, urlPathParams)
+
+	if numUrlPathParams != 0 {
+		backend.Error(w, http.StatusBadRequest, "found unexpected number of URL variables: expected 0, have %d: %#v", numUrlPathParams, urlPathParams)
+		return
+	}
+
+	systemParameters, queryParams, err := resttools.GetSystemParameters(r)
+	if err != nil {
+		backend.Error(w, http.StatusBadRequest, "error in query string: %s", err)
+		return
+	}
+
+	request := &genprotopb.EchoErrorDetailsRequest{}
+	// Intentional: Field values in the URL path override those set in the body.
+	var jsonReader bytes.Buffer
+	bodyReader := io.TeeReader(r.Body, &jsonReader)
+	rBytes := make([]byte, r.ContentLength)
+	if _, err := bodyReader.Read(rBytes); err != nil && err != io.EOF {
+		backend.Error(w, http.StatusBadRequest, "error reading body content: %s", err)
+		return
+	}
+
+	if err := resttools.FromJSON().Unmarshal(rBytes, request); err != nil {
+		backend.Error(w, http.StatusBadRequest, "error reading body params '*': %s", err)
+		return
+	}
+
+	if err := resttools.CheckRequestFormat(&jsonReader, r, request.ProtoReflect()); err != nil {
+		backend.Error(w, http.StatusBadRequest, "REST request failed format check: %s", err)
+		return
+	}
+
+	if len(queryParams) > 0 {
+		backend.Error(w, http.StatusBadRequest, "encountered unexpected query params: %v", queryParams)
+		return
+	}
+	if err := resttools.PopulateSingularFields(request, urlPathParams); err != nil {
+		backend.Error(w, http.StatusBadRequest, "error reading URL path params: %s", err)
+		return
+	}
+
+	marshaler := resttools.ToJSON()
+	marshaler.UseEnumNumbers = systemParameters.EnumEncodingAsInt
+	requestJSON, _ := marshaler.Marshal(request)
+	backend.StdLog.Printf("  request: %s", requestJSON)
+
+	ctx := context.WithValue(r.Context(), resttools.BindingURIKey, "/v1beta1/echo:error-details")
+	response, err := backend.EchoServer.EchoErrorDetails(ctx, request)
+	if err != nil {
+		backend.ReportGRPCError(w, err)
+		return
+	}
+
+	json, err := marshaler.Marshal(response)
+	if err != nil {
+		backend.Error(w, http.StatusInternalServerError, "error json-encoding response: %s", err.Error())
+		return
+	}
+
+	w.Write(json)
+}
+
 // HandleExpand translates REST requests/responses on the wire to internal proto messages for Expand
 //
 //	Generated for HTTP binding pattern: POST "/v1beta1/echo:expand"
diff --git a/server/genrest/genrest.go b/server/genrest/genrest.go
index 6f852ca53..c1ba13339 100644
--- a/server/genrest/genrest.go
+++ b/server/genrest/genrest.go
@@ -45,6 +45,7 @@ func RegisterHandlers(router *gmux.Router, backend *services.Backend) {
 	router.HandleFunc("/v1beta1/compliance/enum", rest.HandleGetEnum).Methods("GET")
 	router.HandleFunc("/v1beta1/compliance/enum", rest.HandleVerifyEnum).Methods("POST")
 	router.HandleFunc("/v1beta1/echo:echo", rest.HandleEcho).Methods("POST")
+	router.HandleFunc("/v1beta1/echo:error-details", rest.HandleEchoErrorDetails).Methods("POST")
 	router.HandleFunc("/v1beta1/echo:expand", rest.HandleExpand).Methods("POST")
 	router.HandleFunc("/v1beta1/echo:collect", rest.HandleCollect).Methods("POST")
 	router.HandleFunc("/v1beta1/echo:pagedExpand", rest.HandlePagedExpand).Methods("POST")
diff --git a/server/genrest/showcase-rest-sample-response.txt b/server/genrest/showcase-rest-sample-response.txt
index 40104e55e..a39071fb2 100644
--- a/server/genrest/showcase-rest-sample-response.txt
+++ b/server/genrest/showcase-rest-sample-response.txt
@@ -23,6 +23,7 @@ Compliance (.google.showcase.v1beta1.Compliance):
 
 Echo (.google.showcase.v1beta1.Echo):
   .google.showcase.v1beta1.Echo.Echo[0] : POST: "/v1beta1/echo:echo"
+  .google.showcase.v1beta1.Echo.EchoErrorDetails[0] : POST: "/v1beta1/echo:error-details"
   .google.showcase.v1beta1.Echo.Expand[0] : POST: "/v1beta1/echo:expand"
   .google.showcase.v1beta1.Echo.Collect[0] : POST: "/v1beta1/echo:collect"
   .google.showcase.v1beta1.Echo.PagedExpand[0] : POST: "/v1beta1/echo:pagedExpand"
@@ -149,7 +150,7 @@ Shim "Echo" (.google.showcase.v1beta1.Echo)
   Imports:
     genprotopb: "github.com/googleapis/gapic-showcase/server/genproto" "github.com/googleapis/gapic-showcase/server/genproto"
     longrunningpbpb: "cloud.google.com/go/longrunning/autogen/longrunningpb" "cloud.google.com/go/longrunning/autogen/longrunningpb"
-  Handlers (8):
+  Handlers (9):
         POST                                 /v1beta1/echo:echo func Echo(request genprotopb.EchoRequest) (response genprotopb.EchoResponse) {}
 ["/" "v1beta1" "/" "echo" ":" "echo"]
 
@@ -168,6 +169,9 @@ Shim "Echo" (.google.showcase.v1beta1.Echo)
         POST                          /v1beta1/echo:pagedExpand func PagedExpand(request genprotopb.PagedExpandRequest) (response genprotopb.PagedExpandResponse) {}
 ["/" "v1beta1" "/" "echo" ":" "pagedExpand"]
 
+        POST                        /v1beta1/echo:error-details func EchoErrorDetails(request genprotopb.EchoErrorDetailsRequest) (response genprotopb.EchoErrorDetailsResponse) {}
+["/" "v1beta1" "/" "echo" ":" "error-details"]
+
         POST                    /v1beta1/echo:pagedExpandLegacy func PagedExpandLegacy(request genprotopb.PagedExpandLegacyRequest) (response genprotopb.PagedExpandResponse) {}
 ["/" "v1beta1" "/" "echo" ":" "pagedExpandLegacy"]