增加websocket支持

vendor/golang.org/x/net/http2/h2c/h2c.go

@@ -44,7 +44,7 @@ func init() {
 // HTTP/1, but unlikely to occur in practice and (2) Upgrading from HTTP/1 to
 // h2c - this works by using the HTTP/1 Upgrade header to request an upgrade to
 // h2c. When either of those situations occur we hijack the HTTP/1 connection,
-// convert it to an HTTP/2 connection and pass the net.Conn to http2.ServeConn.
+// convert it to a HTTP/2 connection and pass the net.Conn to http2.ServeConn.
 type h2cHandler struct {
 	Handler http.Handler
 	s       *http2.Server