#407, as per @mtojek suggestion.

Signed-off-by: Vishal Rana <vr@labstack.com>

engine/standard/response.go

@@ -19,6 +19,11 @@ type (
 		writer    io.Writer
 		logger    *log.Logger
 	}
+
+	responseAdapter struct {
+		http.ResponseWriter
+		writer io.Writer
+	}
 )
 
 // Header implements `engine.Response#Header` method.
@@ -77,3 +82,7 @@ func (r *Response) reset(w http.ResponseWriter, h engine.Header) {
 	r.committed = false
 	r.writer = w
 }
+
+func (r *responseAdapter) Write(b []byte) (n int, err error) {
+	return r.writer.Write(b)
+}

engine/standard/server.go

@@ -129,7 +129,10 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 // WrapHandler wraps `http.Handler` into `echo.HandlerFunc`.
 func WrapHandler(h http.Handler) echo.HandlerFunc {
 	return func(c echo.Context) error {
-		w := c.Response().(*Response).ResponseWriter
+		w := &responseAdapter{
+			ResponseWriter: c.Response().(*Response).ResponseWriter,
+			writer:         c.Response(),
+		}
 		r := c.Request().(*Request).Request
 		h.ServeHTTP(w, r)
 		return nil