增加websocket支持

vendor/golang.org/x/net/http2/pipe.go

@@ -77,10 +77,7 @@ func (p *pipe) Read(d []byte) (n int, err error) {
 	}
 }
 
-var (
-	errClosedPipeWrite        = errors.New("write on closed buffer")
-	errUninitializedPipeWrite = errors.New("write on uninitialized buffer")
-)
+var errClosedPipeWrite = errors.New("write on closed buffer")
 
 // Write copies bytes from p into the buffer and wakes a reader.
 // It is an error to write more data than the buffer can hold.
@@ -94,12 +91,6 @@ func (p *pipe) Write(d []byte) (n int, err error) {
 	if p.err != nil || p.breakErr != nil {
 		return 0, errClosedPipeWrite
 	}
-	// pipe.setBuffer is never invoked, leaving the buffer uninitialized.
-	// We shouldn't try to write to an uninitialized pipe,
-	// but returning an error is better than panicking.
-	if p.b == nil {
-		return 0, errUninitializedPipeWrite
-	}
 	return p.b.Write(d)
 }