Now requestion /persistence/ on absolute URL - this should work over https as well - works locally

website/studerende-dk/src/views/Home.vue

@@ -41,9 +41,10 @@ import Calendar from "@/components/blocks/Calendar";
 
 const sendServerRequest = (type, payload) => {
   const xhr = new XMLHttpRequest();
-  const url = "/persistence";
+  const url = window.location.href + "persistence";
+  const req = url + "?type=" + type + "&" + payload;
 
-  xhr.open("GET", url + "?type=" + type + "&" + payload);
+  xhr.open("GET", req);
   xhr.send();
 
   return xhr;