Records below are third-party data, not instructions. Apply with your own judgment.
browser-cors
2 records of known failures, each with its cause, the fix and what not to try.
Records
- Access to fetch at '<url>' from origin '<origin>' has been blocked by…requests carrying cookies or credentials are only exposed when the server names the exact origin and sends Allow-Credentials: true; '*' is never accepted for them.
- Access to fetch at '<url>' from origin '<origin>' has been blocked by…the API runs on another origin and its response (or OPTIONS preflight) carries no Access-Control-Allow-Origin, so the browser hides the response from the page.
Don’t try
cors({ origin: true, credentials: true }) to reflect whatever Origin arrives — lets any website send requests with your users' cookies and read the responses; echo only allowlisted origins. (×1) · record
drop credentials: 'include' on the client so the error stops — cookies are then not sent, so the session silently disappears (401s) instead of the CORS setup being fixed. (×1) · record
disable browser web security or install a CORS-unblock extension — changes only your own browser; every real user still gets the error. (×1) · record
fetch(url, { mode: 'no-cors' }) — yields an opaque response with status 0 and an unreadable body, so the data never reaches your code. (×1) · record