List of 5xx Server Error codes

  • 500 Internal Server Error

  • 501 Not Implemented
    This error should be very rare in any Web browser. It is more likely if the client is not a Web browser - particularly if the Web server is old. In either case if the client has specified a valid request type, then the Web server is either responding incorrectly or simply needs to be upgraded.

  • 502 Bad Gateway

  • 503 Service Unavailable

  • 504 Gateway Timeout

  • 505 HTTP Version Not Supported

  • 506 Variant Also Negotiates (RFC 2295)

  • 507 Insufficient Storage (WebDAV) (RFC 4918)

  • 509 Bandwidth Limit Exceeded (apache bw/limited extension)
    This status code, while used by many servers, is not specified in any RFCs.

  • 510 Not Extended (RFC 2774)