Add form-fetch-action to some forms, fix "fetch action" resp bug (#37305)

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

modules/test/utils.go

@@ -47,7 +47,7 @@ func ParseJSONError(buf []byte) (ret struct {
 }
 
 func ParseJSONRedirect(buf []byte) (ret struct {
-	Redirect string `json:"redirect"`
+	Redirect *string `json:"redirect"`
 },
 ) {
 	_ = json.Unmarshal(buf, &ret)