tree 3ff955c86e1aa579afe70fda3d5638dcd4fc644e
parent 167db312be3be3d239e24dbe0ab099ab5b9aa783
author Tom Bergan <tombergan@google.com> 1501805077 -0700
committer Tom Bergan <tombergan@google.com> 1502237101 +0000

http2: block RoundTrip when the Transport hits MaxConcurrentStreams

Currently if the http2.Transport hits SettingsMaxConcurrentStreams for a
server, it just makes a new TCP connection and creates the stream on the
new connection. This CL updates that behavior to instead block RoundTrip
until a new stream is available.

I also fixed a second bug, which was necessary to make some tests pass:
Previously, a stream was removed from cc.streams only if either (a) we
received END_STREAM from the server, or (b) we received RST_STREAM from
the server. This CL removes a stream from cc.streams if the request was
cancelled (via ctx.Close, req.Cancel, or resp.Body.Close) before
receiving END_STREAM or RST_STREAM from the server.

Updates golang/go#13774
Updates golang/go#20985
Updates golang/go#21229

Change-Id: I660ffd724c4c513e0f1cc587b404bedb8aff80be
Reviewed-on: https://go-review.googlesource.com/53250
Run-TryBot: Tom Bergan <tombergan@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>