Ignore old padding format of "..."

Author: klzgrad

forwardproxy.go

@@ -302,7 +302,9 @@ func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyht
 			return serveHijack(w, targetConn)
 		case 2: // http2: keep reading from "request" and writing into same response
 			defer r.Body.Close()
-			return dualStream(targetConn, r.Body, w, r.Header.Get("Padding") != "")
+			padding := r.Header.Get("Padding")
+			// Ignores old client padding of "..."
+			return dualStream(targetConn, r.Body, w, padding != "" && padding[0] != '.')
 		}
 
 		panic("There was a check for http version, yet it's incorrect")