Custom error handlers by groups of routes

[emarj]

Hi there,

You can set a custom error handler by setting Echo.HTTPErrorHandler.

It would be nice to have different error handlers for groups of routes, as Group.HTTPErrorHandler My usecase is to use JSON for the /api group and Text/HTML for other routes.

[aldas]

You could add middleware to group that does same things as error handler.

func main() {
	e := echo.New()

	e.HTTPErrorHandler = func(err error, c echo.Context) {
		if c.Response().Committed {
			return
		}
		log.Printf("inside custom textual error andler, err: %v", err)
		c.String(http.StatusInternalServerError, "error text")
	}

	apiErrorHandlerMiddleware := func(next echo.HandlerFunc) echo.HandlerFunc {
		return func(c echo.Context) error {
			err := next(c)
			if err == nil {
				return nil
			}
			// add your custom logic here
			e.DefaultHTTPErrorHandler(err, c)
			return nil // should return nil as we have "handled" the error here
		}
	}
	g := e.Group("/api", apiErrorHandlerMiddleware)

	g.GET("/", func(c echo.Context) error {
		return c.String(http.StatusOK, "OK")
	})

	if err := e.Start(":8080"); err != http.ErrServerClosed {
		log.Fatal(err)
	}
}

NB: this does not consider panics (recover middleware) and when you are using (request)logger middleware what errors these will receive.

[emarj]

That works, thanks!