handler, http: have ContentEncode not write anything if there is no o…

…utput to encode

handler.go

@@ -154,6 +154,10 @@ func getBodyParams(r *http.Request, codec *Codec, values map[string]interface{})
 type ContentEncode struct{}
 
 func (h *ContentEncode) Serve(ctx *Context, w http.ResponseWriter, _ *http.Request) error {
+	if len(ctx.Out) == 0 {
+		return nil
+	}
+
 	codec := ctx.Config.Codecs[w.Header().Get(HeaderContentType)]
 
 	if codec == nil {

http.go

@@ -108,7 +108,7 @@ func (s *Server) Shutdown() error {
 }
 
 func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	s.handler(s.Before...).ServeHTTP(w, r)
+	s.handler(append(s.Before, s.After...)...).ServeHTTP(w, r)
 	s.writeError(w, &Error{Status: http.StatusNotFound, Err: errors.New(http.StatusText(http.StatusNotFound))})
 }