Implement fetch based transport#549

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jbrownsw wants to merge 11 commits intogrpc:masterfrom jbrownsw:master

+887-2

Commits on May 1, 2022

Implemented a basic transport based on the fetch api to replace xhr.
Steve Browne
committed
Implemented a hack using eval to call fetch so we can pass the body as a Uint8Array to support values larger than 127 which string encoding was messing up.
Steve Browne
committed

Commits on May 2, 2022

Created RequestInit js interop type to force body to be a Uint8List and marshal to javascript Uint8Array.
Steve Browne
committed

Commits on May 3, 2022

Made some minor changes to better handle when a streaming request is aborted so that we stop reading gracefully.
Steve Browne
committed

Commits on May 4, 2022

Added fetch transport tests which are mostly the same as xhr, but with some minor changes because of the events. Also made some minor tweaks to fetch to have a String response for the tests like xhr.
Steve Browne
committed

Commits on May 5, 2022

Ignore missing_js_lib_annotation. This shows up with dart SDK 2.12, but not with 2.16 which is what I was using during development.
Steve Browne
committed

Commits on May 11, 2022

Allow malformed in utf8 decode because the responseText may not always be valid utf8.
Steve Browne
committed

Commits on May 12, 2022

Prevent empty responses from triggering a grpc error for null responses.
Steve Browne
committed

Commits on Jun 16, 2022

Iterate through the javascript iterator manually if the keys are not an iterable type. This apparently changed with flutter 3.0.
Steve Browne
committed

Commits on Jul 5, 2022

Use js_util.callMethod rather than calling methods directly on the dynamic javascript types because the resulting code does not work when building web in release mode.
Steve Browne
committed

Commits on Jul 15, 2022

Use AbortController and AbortSignal to properly cancel fetches.
Steve Browne
committed