Add a better example for the recaptcha middleware as requested at: https://github.com/kataras/iris/issues/799

Former-commit-id: 85c3286a9d6be5cf47631e7608f70f3790934e64

context/context.go

@@ -17,7 +17,6 @@ import (
 	"path/filepath"
 	"reflect"
 	"regexp"
-	"runtime"
 	"strconv"
 	"strings"
 	"time"
@@ -1056,7 +1055,7 @@ func (ctx *context) Proceed(h Handler) bool {
 
 // HandlerName returns the current handler's name, helpful for debugging.
 func (ctx *context) HandlerName() string {
-	return runtime.FuncForPC(reflect.ValueOf(ctx.handlers[ctx.currentHandlerIndex]).Pointer()).Name()
+	return HandlerName(ctx.handlers[ctx.currentHandlerIndex])
 }
 
 // Do sets the handler index to zero, executes the first handler

context/handler.go

@@ -1,5 +1,10 @@
 package context
 
+import (
+	"reflect"
+	"runtime"
+)
+
 // A Handler responds to an HTTP request.
 // It writes reply headers and data to the Context.ResponseWriter() and then return.
 // Returning signals that the request is finished;
@@ -20,3 +25,12 @@ type Handler func(Context)
 //
 // See `Handler` for more.
 type Handlers []Handler
+
+// HandlerName returns the name, the handler function informations.
+// Same as `context.HandlerName`.
+func HandlerName(h Handler) string {
+	pc := reflect.ValueOf(h).Pointer()
+	// l, n := runtime.FuncForPC(pc).FileLine(pc)
+	// return fmt.Sprintf("%s:%d", l, n)
+	return runtime.FuncForPC(pc).Name()
+}