diff --git a/.gitignore b/.gitignore
index 77f50ae..cacfae6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -30,4 +30,5 @@ examples/multipleGets
 examples/streamClient
 examples/localServer
 examples/dataStream
+examples/tlsServer
 out
diff --git a/examples/localServer.nim b/examples/localServer.nim
index 70e2e17..706c9e0 100644
--- a/examples/localServer.nim
+++ b/examples/localServer.nim
@@ -3,7 +3,6 @@
 {.define: ssl.}
 
 from std/os import getEnv
-import std/strutils
 import std/asyncdispatch
 import ../src/hyperx/server
 
@@ -14,72 +13,30 @@ const keyFile = getEnv "HYPERX_TEST_KEYFILE"
 
 proc processStream(strm: ClientStream) {.async.} =
   ## Full-duplex echo stream
-  with strm:
-    let data = new string
-    await strm.recvHeaders(data)
-    await strm.sendHeaders(
-      @[(":status", "200")], finish = false
-    )
-    if strm.recvEnded:
-      data[] = "Hello world!"
-      await strm.sendBody(data, finish = true)
-    while not strm.recvEnded:
-      data[].setLen 0
-      await strm.recvBody(data)
-      await strm.sendBody(data, finish = strm.recvEnded)
-    if not strm.sendEnded:
-      # recv ended while sending; trailer headers or empty data recv
-      data[].setLen 0
-      await strm.sendBody(data, finish = true)
-
-proc processStreamHandler(strm: ClientStream, propagateErr: bool) {.async.} =
-  try:
-    await processStream(strm)
-  except HyperxStrmError as err:
-    if propagateErr:
-      raise err
-    debugEcho err.msg
-  except HyperxConnError as err:
-    if propagateErr:
-      raise err
-    debugEcho err.msg
-
-proc processClient(client: ClientContext, propagateErr: bool) {.async.} =
-  with client:
-    while client.isConnected:
-      let strm = await client.recvStream()
-      asyncCheck processStreamHandler(strm, propagateErr)
-
-proc processClientHandler(client: ClientContext, propagateErr: bool) {.async.} =
-  try:
-    await processClient(client, propagateErr)
-  except HyperxConnError as err:
-    if propagateErr:
-      raise err
-    debugEcho err.msg
-
-# xxx propagateErr = false
-proc serve*(server: ServerContext, propagateErr = true) {.async.} =
-  with server:
-    while server.isConnected:
-      let client = await server.recvClient()
-      asyncCheck processClientHandler(client, propagateErr)
-
-proc newServer*(): ServerContext =
-  newServer(
+  let data = new string
+  await strm.recvHeaders(data)
+  await strm.sendHeaders(
+    @[(":status", "200")], finish = false
+  )
+  if strm.recvEnded:
+    data[] = "Hello world!"
+    await strm.sendBody(data, finish = true)
+  while not strm.recvEnded:
+    data[].setLen 0
+    await strm.recvBody(data)
+    await strm.sendBody(data, finish = strm.recvEnded)
+  if not strm.sendEnded:
+    # recv ended while sending; trailer headers or empty data recv
+    data[].setLen 0
+    await strm.sendBody(data, finish = true)
+
+proc main() {.async.} =
+  echo "Serving forever"
+  let server = newServer(
     localHost, localPort, certFile, keyFile
   )
+  await server.serve(processStream)
 
 when isMainModule:
-  proc main() {.async.} =
-    echo "Serving forever"
-    var server = newServer()
-    await server.serve(propagateErr = false)
-  when true:
-    waitFor main()
-  else:  # this is better for profiling/benchmarking but uses 100% CPU
-    var fut = main()
-    while not fut.finished:
-      poll(0)
-    fut.read()
+  waitFor main()
   echo "ok"
diff --git a/src/hyperx/server.nim b/src/hyperx/server.nim
index 501744c..59f6b5c 100644
--- a/src/hyperx/server.nim
+++ b/src/hyperx/server.nim
@@ -179,3 +179,41 @@ proc sendHeaders*(
     client.hpackEncode(headers, "content-length", $contentLen)
   let finish = contentLen <= 0
   result = strm.sendHeadersImpl(headers, finish)
+
+type StreamCallback* =
+  proc (stream: ClientStream): Future[void] {.closure, gcsafe.}
+
+proc processStreamHandler(
+  strm: ClientStream,
+  callback: StreamCallback
+) {.async.} =
+  try:
+    with strm:
+      await callback(strm)
+  except HyperxError:
+    debugInfo getCurrentException().getStackTrace()
+    debugInfo getCurrentException().msg
+
+proc processClientHandler(
+  client: ClientContext,
+  callback: StreamCallback
+) {.async.} =
+  try:
+    with client:
+      while client.isConnected:
+        let strm = await client.recvStream()
+        asyncCheck processStreamHandler(strm, callback)
+  except HyperxError:
+    debugInfo getCurrentException().getStackTrace()
+    debugInfo getCurrentException().msg
+  when defined(hyperxStats):
+    echoStats client
+
+proc serve*(
+  server: ServerContext,
+  callback: StreamCallback
+) {.async.} =
+  with server:
+    while server.isConnected:
+      let client = await server.recvClient()
+      asyncCheck processClientHandler(client, callback)
diff --git a/tests/functional/tserver.nim b/tests/functional/tserver.nim
index 597abdb..eaca1ca 100644
--- a/tests/functional/tserver.nim
+++ b/tests/functional/tserver.nim
@@ -11,62 +11,33 @@ const certFile = getEnv "HYPERX_TEST_CERTFILE"
 const keyFile = getEnv "HYPERX_TEST_KEYFILE"
 
 proc processStream(strm: ClientStream) {.async.} =
-  with strm:
-    let data = new string
-    await strm.recvHeaders(data)
-    if "x-flow-control-check" in data[]:
-      # let recv buff for a bit
-      #debugEcho "sleeping"
-      await sleepAsync(10_000)
-    await strm.sendHeaders(
-      @[(":status", "200")], finish = false
-    )
+  let data = new string
+  await strm.recvHeaders(data)
+  if "x-flow-control-check" in data[]:
+    # let recv buff for a bit
+    #debugEcho "sleeping"
+    await sleepAsync(10_000)
+  await strm.sendHeaders(
+    @[(":status", "200")], finish = false
+  )
+  await strm.sendBody(data, finish = strm.recvEnded)
+  while not strm.recvEnded:
+    data[].setLen 0
+    await strm.recvBody(data)
     await strm.sendBody(data, finish = strm.recvEnded)
-    while not strm.recvEnded:
-      data[].setLen 0
-      await strm.recvBody(data)
-      await strm.sendBody(data, finish = strm.recvEnded)
-  #GC_fullCollect()
-
-proc processStreamHandler(strm: ClientStream) {.async.} =
-  try:
-    await processStream(strm)
-  except HyperxStrmError as err:
-    debugEcho err.msg
-  except HyperxConnError as err:
-    debugEcho err.msg
-
-proc processClient(client: ClientContext) {.async.} =
-  with client:
-    while client.isConnected:
-      let strm = await client.recvStream()
-      asyncCheck processStreamHandler(strm)
-
-proc processClientHandler(client: ClientContext) {.async.} =
-  try:
-    await processClient(client)
-  except HyperxConnError as err:
-    debugEcho err.msg
-  when defined(hyperxStats):
-    echoStats client
   #GC_fullCollect()
 
 proc serve*(server: ServerContext) {.async.} =
-  with server:
-    while server.isConnected:
-      let client = await server.recvClient()
-      asyncCheck processClientHandler(client)
+  await server.serve(processStream)
 
-proc newServer(): ServerContext =
-  newServer(
+proc main() {.async.} =
+  echo "Serving forever"
+  var server = newServer(
     localHost, localPort, certFile, keyFile
   )
+  await server.serve()
 
 when isMainModule:
-  proc main() {.async.} =
-    echo "Serving forever"
-    var server = newServer()
-    await server.serve()
   waitFor main()
   doAssert not hasPendingOperations()
   echo "ok"