net/http: update bundled http2, fix Transport memory leak

Updates x/net/http2 to git rev 644ffc for three CLs since the last update:

http2: don't add *Response to activeRes in Transport on Headers.END_STREAM
https://golang.org/cl/19134

http2: add mechanism to send undeclared Trailers mid handler
https://golang.org/cl/19131

http2: remove unused variable
https://golang.org/cl/18936

The first in the list above is the main fix that's necessary. The
other are two are in the git history but along for the cmd/bundle
ride. The middle CL is well-tested, small (mostly comments),
non-tricky, and almost never seen (since nobody really uses Trailers).
The final CL is just deleting an unused global variable.

Fixes #14084 again (with more tests)

Change-Id: Iac51350acee9c51d32bf7779d57e9d5a5482b928
Reviewed-on: https://go-review.googlesource.com/19135
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>

1 files changed, 8 insertions, 4 deletions

diff --git a/src/net/http/clientserver_test.go b/src/net/http/clientserver_test.go
index 9b581e7311..fbaa805712 100644
--- a/src/net/http/clientserver_test.go
+++ b/src/net/http/clientserver_test.go
@@ -1001,13 +1001,17 @@ func TestTransportDiscardsUnneededConns(t *testing.T) {
 }
 
 // tests that Transport doesn't retain a pointer to the provided request.
-func TestTransportGCRequest_h1(t *testing.T) { testTransportGCRequest(t, h1Mode) }
-func TestTransportGCRequest_h2(t *testing.T) { testTransportGCRequest(t, h2Mode) }
-func testTransportGCRequest(t *testing.T, h2 bool) {
+func TestTransportGCRequest_Body_h1(t *testing.T)   { testTransportGCRequest(t, h1Mode, true) }
+func TestTransportGCRequest_Body_h2(t *testing.T)   { testTransportGCRequest(t, h2Mode, true) }
+func TestTransportGCRequest_NoBody_h1(t *testing.T) { testTransportGCRequest(t, h1Mode, false) }
+func TestTransportGCRequest_NoBody_h2(t *testing.T) { testTransportGCRequest(t, h2Mode, false) }
+func testTransportGCRequest(t *testing.T, h2, body bool) {
 	defer afterTest(t)
 	cst := newClientServerTest(t, h2, HandlerFunc(func(w ResponseWriter, r *Request) {
 		ioutil.ReadAll(r.Body)
-		io.WriteString(w, "Hello.")
+		if body {
+			io.WriteString(w, "Hello.")
+		}
 	}))
 	defer cst.close()