From 42b11863606139133313f265e6cf2a4d1d8ca972 Mon Sep 17 00:00:00 2001
From: Damien Neil <dneil@google.com>
Date: Wed, 1 Mar 2023 15:35:42 -0800
Subject: [PATCH] http2: support ResponseController.EnableFullDuplex
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The ResponseController.EnableFullDuplex method indicates that an HTTP
handler intends to interleave reads from a request body with writes
to the response body.

Add an EnableFullDuplex method to the ResponseWriter so we don't
return a not-supported error. The HTTP/2 server always supports
full duplex, so this is a no-op.

For golang/go#57786

Change-Id: I6529e6ce01d59b8b48fb67ba7c244255df57c174
Reviewed-on: https://go-review.googlesource.com/c/net/+/472717
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Дарья Бочкар <dasha7vanya@gmail.com>
---
 http2/server.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/http2/server.go b/http2/server.go
index 617b4a476..d6d8ac88b 100644
--- a/http2/server.go
+++ b/http2/server.go
@@ -2880,6 +2880,11 @@ func (w *responseWriter) SetWriteDeadline(deadline time.Time) error {
 	return nil
 }
 
+func (w *responseWriter) EnableFullDuplex() error {
+	// We always support full duplex responses, so this is a no-op.
+	return nil
+}
+
 func (w *responseWriter) Flush() {
 	w.FlushError()
 }