net/http: quiet http2 log spam

Updates x/net/http2 to git rev eb066e3 for https://golang.org/cl/18932

Fixes #13925
Fixes #14061

Change-Id: I73f8c09232877404362358240b7b369bb9c76a12
Reviewed-on: https://go-review.googlesource.com/18934Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/net/http/h2_bundle.go

@@ -32,6 +32,7 @@ import (
 	"net/textproto"
 	"net/url"
 	"os"
+	"reflect"
 	"runtime"
 	"sort"
 	"strconv"
@@ -2850,12 +2851,50 @@ func (sc *http2serverConn) logf(format string, args ...interface{}) {
 	}
 }
 
+var http2uintptrType = reflect.TypeOf(uintptr(0))
+
+// errno returns v's underlying uintptr, else 0.
+//
+// TODO: remove this helper function once http2 can use build
+// tags. See comment in isClosedConnError.
+func http2errno(v error) uintptr {
+	if rv := reflect.ValueOf(v); rv.Kind() == reflect.Uintptr {
+		return uintptr(rv.Uint())
+	}
+	return 0
+}
+
+// isClosedConnError reports whether err is an error from use of a closed
+// network connection.
+func http2isClosedConnError(err error) bool {
+	if err == nil {
+		return false
+	}
+
+	str := err.Error()
+	if strings.Contains(str, "use of closed network connection") {
+		return true
+	}
+
+	if runtime.GOOS == "windows" {
+		if oe, ok := err.(*net.OpError); ok && oe.Op == "read" {
+			if se, ok := oe.Err.(*os.SyscallError); ok && se.Syscall == "wsarecv" {
+				const WSAECONNABORTED = 10053
+				const WSAECONNRESET = 10054
+				if n := http2errno(se.Err); n == WSAECONNRESET || n == WSAECONNABORTED {
+					return true
+				}
+			}
+		}
+	}
+	return false
+}
+
 func (sc *http2serverConn) condlogf(err error, format string, args ...interface{}) {
 	if err == nil {
 		return
 	}
-	str := err.Error()
-	if err == io.EOF || strings.Contains(str, "use of closed network connection") {
+	if err == io.EOF || err == io.ErrUnexpectedEOF || http2isClosedConnError(err) {
 
 		sc.vlogf(format, args...)
 	} else {
@@ -3372,7 +3411,7 @@ func (sc *http2serverConn) processFrameFromReader(res http2readFrameResult) bool
 			sc.goAway(http2ErrCodeFrameSize)
 			return true
 		}
-		clientGone := err == io.EOF || strings.Contains(err.Error(), "use of closed network connection")
+		clientGone := err == io.EOF || err == io.ErrUnexpectedEOF || http2isClosedConnError(err)
 		if clientGone {
 
 			return false
@@ -3401,7 +3440,7 @@ func (sc *http2serverConn) processFrameFromReader(res http2readFrameResult) bool
 		return true
 	default:
 		if res.err != nil {
-			sc.logf("http2: server closing client connection; error reading frame from client %s: %v", sc.conn.RemoteAddr(), err)
+			sc.vlogf("http2: server closing client connection; error reading frame from client %s: %v", sc.conn.RemoteAddr(), err)
 		} else {
 			sc.logf("http2: server closing client connection: %v", err)
 		}