5xx Server Error
The server failed to fulfill an apparently valid request.
Response status codes beginning with the digit "5" indicate cases in which the server is aware that it has encountered an error or is otherwise incapable of performing the request. Except when responding to a HEAD request, the server should include an entity containing an explanation of the error situation, and indicate whether it is a temporary or permanent condition. Likewise, user agents should display any included entity to the user. These response codes are applicable to any request method.
- 500 Internal Server Error
- A generic error message, given when no more specific message is suitable.
- 501 Not Implemented
- The server either does not recognize the request method, or it lacks the ability to fulfill the request.
- 502 Bad Gateway
- The server was acting as a gateway or proxy and received an invalid response from the upstream server.
- 503 Service Unavailable
- The server is currently unavailable (because it is overloaded or down for maintenance). Generally, this is a temporary state.
- 504 Gateway Timeout
- The server was acting as a gateway or proxy and did not receive a timely response from the upstream server.
- 505 HTTP Version Not Supported
- The server does not support the HTTP protocol version used in the request.
- 506 Variant Also Negotiates (RFC 2295)
- Transparent content negotiation for the request results in a circular reference.
- 507 Insufficient Storage (WebDAV; RFC 4918)
- The server is unable to store the representation needed to complete the request.
- 508 Loop Detected (WebDAV; RFC 5842)
- The server detected an infinite loop while processing the request (sent in lieu of 208).
- 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)
- Further extensions to the request are required for the server to fulfill it.
- 511 Network Authentication Required (RFC 6585)
- The client needs to authenticate to gain network access. Intended for use by intercepting proxies used to control access to the network (e.g. "captive portals" used to require agreement to Terms of Service before granting full Internet access via a Wi-Fi hotspot).
- 598 Network read timeout error (Unknown)
- This status code is not specified in any RFCs, but is used by Microsoft Corp. HTTP proxies to signal a network read timeout behind the proxy to a client in front of the proxy.
- 599 Network connect timeout error (Unknown)
- This status code is not specified in any RFCs, but is used by Microsoft Corp. HTTP proxies to signal a network connect timeout behind the proxy to a client in front of the proxy.
Read more about this topic: List Of HTTP Status Codes
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