fix https://github.com/kataras/iris/issues/1713 and add a simple usage example of the 'RemoveHandler'

_examples/README.md

@@ -48,6 +48,7 @@
     * Middleware
         * [Per Route](routing/writing-a-middleware/per-route/main.go)
         * [Globally](routing/writing-a-middleware/globally/main.go)
+        * [Remove a Handler](routing/remove-handler/main.go)
         * Share Values
             * [Share Services](routing/writing-a-middleware/share-services/main.go)
             * [Share Functions](routing/writing-a-middleware/share-funcs/main.go)

_examples/routing/remove-handler/main.go

@@ -0,0 +1,29 @@
+package main
+
+import "github.com/kataras/iris/v12"
+
+func main() {
+	app := newApp()
+	app.Listen(":8080")
+}
+
+func newApp() *iris.Application {
+	app := iris.New()
+
+	api := app.Party("/api")
+	api.Use(myMiddleware)
+	users := api.Party("/users")
+	users.Get("/", usersIndex).RemoveHandler(myMiddleware)
+	// OR for all routes under a Party (or Application):
+	// users.RemoveHandler(...)
+
+	return app
+}
+
+func myMiddleware(ctx iris.Context) {
+	ctx.WriteString("Middleware\n")
+}
+
+func usersIndex(ctx iris.Context) {
+	ctx.WriteString("OK")
+}

_examples/routing/remove-handler/main_test.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"testing"
+
+	"github.com/kataras/iris/v12/httptest"
+)
+
+func TestSimpleRouteRemoveHandler(t *testing.T) {
+	app := newApp()
+	e := httptest.New(t, app)
+
+	e.GET("/api/users").Expect().Status(httptest.StatusOK).Body().Equal("OK")
+}

context/context.go

@@ -2280,7 +2280,7 @@ type internalJSONDecoder interface {
 
 func (cfg JSONReader) getDecoder(r io.Reader, globalShouldOptimize bool) (decoder internalJSONDecoder) {
 	if cfg.Optimize || globalShouldOptimize {
-		decoder = jsoniter.NewDecoder(r)
+		decoder = jsoniter.ConfigCompatibleWithStandardLibrary.NewDecoder(r)
 	} else {
 		decoder = json.NewDecoder(r)
 	}

core/handlerconv/from_std.go

@@ -16,40 +16,23 @@ import (
 func FromStd(handler interface{}) context.Handler {
 	switch h := handler.(type) {
 	case context.Handler:
-		{
-			//
-			// it's already an Iris Handler
-			//
 		return h
-		}
+	case func(*context.Context):
+		return h
 	case http.Handler:
-		{
-			//
 		// handlerFunc.ServeHTTP(w,r)
-			//
 		return func(ctx *context.Context) {
 			h.ServeHTTP(ctx.ResponseWriter(), ctx.Request())
 		}
-		}
 	case func(http.ResponseWriter, *http.Request):
-		{
-			//
 		// handlerFunc(w,r)
-			//
 		return FromStd(http.HandlerFunc(h))
-		}
 	case func(http.ResponseWriter, *http.Request, http.HandlerFunc):
-		{
-			//
 		// handlerFunc(w,r, http.HandlerFunc)
 		//
 		return FromStdWithNext(h)
-		}
 	default:
-		{
-			//
 		// No valid handler passed
-			//
 		panic(fmt.Errorf(`
 			Passed argument is not a func(iris.Context) neither one of these types:
 			- http.Handler
@@ -59,7 +42,6 @@ func FromStd(handler interface{}) context.Handler {
 			It seems to be a %T points to: %v`, handler, handler))
 	}
 }
-}
 
 // FromStdWithNext receives a standar handler - middleware form - and returns a
 // compatible context.Handler wrapper.

core/router/api_builder.go

@@ -1210,7 +1210,7 @@ func (api *APIBuilder) RemoveHandler(namesOrHandlers ...interface{}) Party {
 		switch h := nameOrHandler.(type) {
 		case string:
 			handlerName = h
-		case context.Handler:
+		case context.Handler, func(*context.Context):
 			handlerName = context.HandlerName(h)
 		case *int:
 			counter = h

core/router/route.go

@@ -159,7 +159,7 @@ func (r *Route) RemoveHandler(namesOrHandlers ...interface{}) (count int) {
 		switch h := nameOrHandler.(type) {
 		case string:
 			handlerName = h
-		case context.Handler:
+		case context.Handler, func(*context.Context):
 			handlerName = context.HandlerName(h)
 		default:
 			panic(fmt.Sprintf("remove handler: unexpected type of %T", h))