add supprt for go1.20 http.rwUnwrapper

Author: imxyb

response.go

@@ -94,6 +94,13 @@ func (r *Response) Hijack() (net.Conn, *bufio.ReadWriter, error) {
 	return r.Writer.(http.Hijacker).Hijack()
 }
 
+// Unwrap returns the original http.ResponseWriter.
+// ResponseController can be used to access the original http.ResponseWriter.
+// See [https://go.dev/blog/go1.20]
+func (r *Response) Unwrap() http.ResponseWriter {
+	return r.Writer
+}
+
 func (r *Response) reset(w http.ResponseWriter) {
 	r.beforeFuncs = nil
 	r.afterFuncs = nil

response_test.go

@@ -72,3 +72,11 @@ func TestResponse_ChangeStatusCodeBeforeWrite(t *testing.T) {
 
 	assert.Equal(t, http.StatusOK, rec.Code)
 }
+
+func TestResponse_Unwrap(t *testing.T) {
+	e := New()
+	rec := httptest.NewRecorder()
+	res := &Response{echo: e, Writer: rec}
+
+	assert.Equal(t, rec, res.Unwrap())
+}