409 Conflict
When the server responds with the HTTP status code 409 Conflict, it means that the client's request cannot be fulfilled because it conflicts...
407 Proxy Authentication Required
When the server responds with a 407 Proxy Authentication Required status code, it means that the client needs to provide valid...
406 Not Acceptable
When the server responds with the HTTP status code 406 Not Acceptable, it means that the client's request for the resource included...