fix url rewrite for cors bypass

jsonform.gadget.js

@@ -256,7 +256,8 @@
     protocol = url.protocol;
     if (protocol === "http:" || protocol === "https:") {
       if (window.location.protocol !==  protocol) {
-        url = new URL(decodeURI($ref).replace(protocol + "//", window.location.protocol + "//"));
+        // try change url protocol to https
+        url = new URL(url.toString().replace(protocol + "//", window.location.protocol + "//"));
         // throw new Error("You cannot mixed http and https calls");
       }
     }