tree 4c8141216600f66c1dd09cd9cd6fece9c9a0cca7
parent 4a395b0a80a1ad88af9adac9059692222edbd903
author Damien Neil <dneil@google.com> 1661892435 -0700
committer Damien Neil <dneil@google.com> 1663699132 +0000

http2: send undeclared trailers when body is not written

Fix a bug wherein undeclared trailers (set with the "Trailer:" prefix)
were not sent when the response body is neither written nor flushed.

We were testing responseWriterState.hasTrailers before promoting
undeclared trailers into rws.trailers, resulting in the response headers
being sent with an END_STREAM flag. Promote undeclared headers earlier
so that we leave the stream open for them to be sent.

For golang/go#54723

Change-Id: Ic036925f4a7ec775282b6e474aa72249d6418b23
Reviewed-on: https://go-review.googlesource.com/c/net/+/426874
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Damien Neil <dneil@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>