Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Methods'

Reason

Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Methods'

What went wrong?

The response to the {{Glossary("CORS")}}  request that was sent by the server includes an {{HTTPHeader("Access-Control-Allow-Methods")}}  header which includes at least one invalid method name.

The Access-Control-Allow-Methods header is sent by the server to let the client know what HTTP request methods it supports for CORS requests. The header’s value is a comma-delineated string of HTTP method names, such as {{HTTPMethod("GET")}} , {{HTTPMethod("POST")}} , or {{HTTPMethod("HEAD")}} . If any of the specified values are not recognized by the client {{Glossary("user agent")}} , this error occurs.

This is a problem that most likely can only be fixed on the server side, by modifying the server’s configuration to no longer send the invalid or unknown method name with the Access-Control-Allow-Methods header. It may also be worth checking to ensure that the user agent or HTTP library you’re using on the client is up-to-date.

See also

• CORS errors
• Glossary: {{Glossary("CORS")}} 
• CORS introduction
• HTTP request methods