!!! Overview !! [OAuth 2.0] [{$pagename}] is defined in [RFC 7009] and registered in the [OAuth Parameters Registry]. [{$pagename}] indicates the [Authorization Server] does __NOT__ support the revocation of the presented [token_type]. That is, the client tried to revoke an access token on a server not supporting this feature. If the server responds with [HTTP status code 503|HTTP 503], the client must assume the token still exists and may retry after a reasonable delay. The server may include a "Retry-After" header in the response to indicate how long the service is expected to be unavailable to the requesting client. !! More Information There might be more information for this subject on one of the following: [{ReferringPagesPlugin before='*' after='\n' }]