fix timeout middleware not sending status code when handler returns an error (fix #1804)

middleware/timeout.go

@@ -106,6 +106,11 @@ func (t echoHandlerFuncWrapper) ServeHTTP(rw http.ResponseWriter, r *http.Reques
 	// so on timeout writer stays what http.TimeoutHandler uses and prevents writing headers/body
 	t.ctx.Response().Writer = originalWriter
 	if err != nil {
+		// call global error handler to write error to the client. This is needed or `http.TimeoutHandler` will send status code by itself
+		// and after that our tries to write status code will not work anymore
+		t.ctx.Error(err)
+		// we pass error from handler to middlewares up in handler chain to act on it if needed. But this means that
+		// global error handler is probably be called twice as `t.ctx.Error` already does that.
 		t.errChan <- err
 	}
 }

middleware/timeout_test.go

@@ -71,10 +71,34 @@ func TestTimeoutErrorOutInHandler(t *testing.T) {
 	c := e.NewContext(req, rec)
 
 	err := m(func(c echo.Context) error {
-		return errors.New("err")
+		return echo.NewHTTPError(http.StatusTeapot, "err")
 	})(c)
 
 	assert.Error(t, err)
+	assert.Equal(t, http.StatusTeapot, rec.Code)
+	assert.Equal(t, "{\"message\":\"err\"}\n", rec.Body.String())
+}
+
+func TestTimeoutSuccessfulRequest(t *testing.T) {
+	t.Parallel()
+	m := TimeoutWithConfig(TimeoutConfig{
+		// Timeout has to be defined or the whole flow for timeout middleware will be skipped
+		Timeout: 50 * time.Millisecond,
+	})
+
+	req := httptest.NewRequest(http.MethodGet, "/", nil)
+	rec := httptest.NewRecorder()
+
+	e := echo.New()
+	c := e.NewContext(req, rec)
+
+	err := m(func(c echo.Context) error {
+		return c.JSON(http.StatusCreated, map[string]string{"data": "ok"})
+	})(c)
+
+	assert.NoError(t, err)
+	assert.Equal(t, http.StatusCreated, rec.Code)
+	assert.Equal(t, "{\"data\":\"ok\"}\n", rec.Body.String())
 }
 
 func TestTimeoutOnTimeoutRouteErrorHandler(t *testing.T) {