Fixes fetchWsUrl

src/static/scripts/admin_diagnostics.js

@@ -349,7 +349,13 @@ async function checkHttpResponse() {
 async function fetchWsUrl(wsUrl) {
     return new Promise((resolve, reject) => {
         try {
-            const ws = new WebSocket(wsUrl);
+            const url = new URL(wsUrl);
+            if (url.protocol == 'http:') {
+                url.protocol = 'ws:';
+            } else if (url.protocol == 'https:') {
+                url.protocol = 'wss:';
+            }
+            const ws = new WebSocket(url.href);
             ws.onopen = () => {
                 ws.close();
                 resolve(true);
@@ -424,4 +430,4 @@ document.addEventListener("DOMContentLoaded", (event) => {
     if (btnCopySupport) {
         btnCopySupport.addEventListener("click", copyToClipboard);
     }
-});
+});