Errors: CORSMIssingAllowCredentials

Reason

Reason: expected ‘true’ in CORS header ‘Access-Control-Allow-Credentials’

What went wrong?

The CORS request requires that the server permit the use of credentials, but the server's Access-Control-Allow-Credentials header's value isn't set to true to enable their use.

To fix this problem on the client side, revise the code to not request the use of credentials.

• If the request is being issued using XMLHttpRequest, make sure you're not setting withCredentials to true.
• If using Server-sent events, make sure EventSource.withCredentials is false (it's the default value).
• If using the Fetch API, make sure Request.credentials is "omit".

To eliminate this error by changing the server's configuration, adjust the server's configuration to set the Access-Control-Allow-Credentials header's value to true.

See also

• CORS errors
• Glossary: CORS
• CORS introduction