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--- wiki:allowing_cors_requests [2024/10/11 07:52] – [Allowing CORS requests] add scrot of error antisa
+++ wiki:allowing_cors_requests [2026/09/15 10:54] (current) – [Allowing CORS requests] add info about only needing one type of requests antisa
@@ Line 10: / Line 10: @@
 Below is a config for preflighted and simple requests which will allow requests (e.g. from fetch function in browser console) from **example.org** domain to the domain **example.com**
+<WRAP center round info 60%>
+You might only need the preflighted requests (if clause) if you notice duplicate **access-control-** headers being returned.
+</WRAP>
 ===== nginx =====
@@ Line 27: / Line 32: @@
 ...
 if ($request_method = 'OPTIONS') {
-add_header 'X-preflighted' 'true';
+  add_header 'X-preflighted' 'true';
-add_header 'Access-Control-Allow-Credentials' 'true';
+  add_header 'Access-Control-Allow-Origin' https://example.org always;
-add_header 'Access-Control-Allow-Methods' 'OPTIONS';
+  add_header 'Access-Control-Allow-Credentials' 'true';
-add_header 'Access-Control-Allow-Headers' '*';
+  add_header 'Access-Control-Allow-Headers' 'Origin, Content-Type, Accept, Authorization';
-add_header 'Access-Control-Allow-Origin' example.org always;
+  add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS';
-      return 204;
+  return 204;
-   }
+}
+add_header 'Access-Control-Allow-Origin' https://example.org always;
 add_header 'Access-Control-Allow-Credentials' 'true';
-add_header 'Access-Control-Allow-Methods' '*';
+add_header 'Access-Control-Allow-Headers' 'Origin, Content-Type, Accept, Authorization';
-add_header 'Access-Control-Allow-Headers' '*';
+add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS' always;
-add_header 'Access-Control-Allow-Origin' example.org always;
 ...
@@ Line 45: / Line 51: @@
         proxy_http_version 1.1;
         proxy_set_header Connection "";
+        # Ensure cookies and headers pass correctly
+        proxy_pass_request_headers on;
+        proxy_set_header Cookie $http_cookie;
     }
 }
 </code>
+<WRAP center round tip 60%>
+If you are also setting a cookie, remember that it can only be set from the same domain i.e. if there's an app running under app.example.org and it sends ''Set-Cookie yummy=fe.example.com'', this won't work. You will get an error like ''Cookie “yummy” has been rejected for invalid domain.''
+</WRAP>
 ====== Tested on ======