diff --git a/modules/mining-checker/assets/js/app.js b/modules/mining-checker/assets/js/app.js
index ec1e7e7..7ab9ada 100644
--- a/modules/mining-checker/assets/js/app.js
+++ b/modules/mining-checker/assets/js/app.js
@@ -205,7 +205,12 @@
 
     let response;
     try {
-      response = await fetch(requestUrl, { ...requestOptions, signal: controller.signal });
+      response = await fetch(requestUrl, {
+        ...requestOptions,
+        credentials: 'same-origin',
+        redirect: 'manual',
+        signal: controller.signal,
+      });
     } catch (error) {
       window.clearTimeout(timeoutId);
       if (error && error.name === 'AbortError') {
@@ -224,12 +229,26 @@
         type: 'request:error',
         method: requestOptions.method || 'GET',
         url: requestUrl,
+        page_url: window.location.href,
+        online: window.navigator ? window.navigator.onLine : null,
         message: error && error.message ? error.message : 'Fetch fehlgeschlagen',
       });
       throw error;
     }
 
     window.clearTimeout(timeoutId);
+    if (response.type === 'opaqueredirect' || (response.status >= 300 && response.status < 400)) {
+      const location = response.headers ? response.headers.get('Location') : '';
+      emitDebug({
+        type: 'request:redirect',
+        method: requestOptions.method || 'GET',
+        url: requestUrl,
+        status: response.status,
+        location: location || null,
+      });
+      throw new Error(`API request wurde weitergeleitet${location ? ` nach ${location}` : ''}. Bitte Login/Session und Proxy-Rewrite pruefen.`);
+    }
+
     const payload = await response.json().catch(() => ({}));
     emitDebug({
       type: 'request:response',