buffalo allows mux to handle 405 responses fixes #978

app.go

@@ -157,6 +157,12 @@ func New(opts Options) *App {
 		a.ErrorHandlers.Get(404)(404, err, c)
 	})
 
+	a.router.MethodNotAllowedHandler = http.HandlerFunc(func(res http.ResponseWriter, req *http.Request) {
+		c := a.newContext(RouteInfo{}, res, req)
+		err := errors.Errorf("method not found: %s %s", req.Method, req.URL.Path)
+		a.ErrorHandlers.Get(405)(405, err, c)
+	})
+
 	if a.MethodOverride == nil {
 		a.MethodOverride = MethodOverride
 	}

router_test.go

@@ -35,6 +35,13 @@ func testApp() *App {
 	rt.DELETE("/", h)
 	rt.OPTIONS("/", h)
 	rt.PATCH("/", h)
+
+	a.ErrorHandlers[405] = func(status int, err error, c Context) error {
+		res := c.Response()
+		res.WriteHeader(status)
+		res.Write([]byte("my custom 405"))
+		return nil
+	}
 	return a
 }
 
@@ -50,6 +57,14 @@ func otherTestApp() *App {
 	return a
 }
 
+func Test_MethodNotFoundError(t *testing.T) {
+	r := require.New(t)
+	w := willie.New(testApp())
+	res := w.HTML("/bar").Post(nil)
+	r.Equal(405, res.Code)
+	r.Contains(res.Body.String(), "my custom 405")
+}
+
 func Test_Mount_Buffalo(t *testing.T) {
 	r := require.New(t)
 	a := testApp()