[net] internal/http3: add server to client header trailer support

[Nicholas Husin (Gerrit)]

Nicholas Husin submitted the change

Change information

Commit message:

internal/http3: add server to client trailer header support

This change implements support for Server to send trailer headers, and
for ClientConn to receive said trailer headers. This is just like
go.dev/cl/743600, but in the opposite direction.

The bulk of the implementation relies on the trailer header encoding and
decoding support that was added to bodyWriter and bodyReader
respectively in go.dev/cl/743600.

For golang/go#70914

Change-Id: I0efded4b1ac3e3c6b9479f18402e02e9e764d4a2

Reviewed-on: https://go-review.googlesource.com/c/net/+/744220

LUCI-TryBot-Result: Go LUCI <golang...@luci-project-accounts.iam.gserviceaccount.com>

Reviewed-by: Nicholas Husin <hu...@google.com>

Reviewed-by: Damien Neil <dn...@google.com>

Files:

• M internal/http3/body.go
• M internal/http3/roundtrip.go
• M internal/http3/roundtrip_test.go
• M internal/http3/server.go
• M internal/http3/server_test.go
• M internal/http3/transport_test.go

Change size: M

Delta: 6 files changed, 220 insertions(+), 3 deletions(-)

Branch: refs/heads/master

Submit Requirements:

• Code-Review: +2 by Damien Neil, +1 by Nicholas Husin
• TryBots-Pass: LUCI-TryBot-Result+1 by Go LUCI

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Gerrit

Gerrit-MessageType: merged

Gerrit-Project: net

Gerrit-Branch: master

Gerrit-Change-Id: I0efded4b1ac3e3c6b9479f18402e02e9e764d4a2

Gerrit-Change-Number: 744220

Gerrit-PatchSet: 5

Gerrit-Owner: Nicholas Husin <n...@golang.org>

Gerrit-Reviewer: Damien Neil <dn...@google.com>

Gerrit-Reviewer: Go LUCI <golang...@luci-project-accounts.iam.gserviceaccount.com>

Gerrit-Reviewer: Nicholas Husin <hu...@google.com>

Gerrit-Reviewer: Nicholas Husin <n...@golang.org>