5xx Error Codes
List of HTTP Status Codes | 500 range
500Internal Server ErrorA generic error message, given when an unexpected condition was encountered and no more specific message is suitable.
501Not ImplementedThe server either does not recognize the request method, or it lacks the ability to fulfil the request. Usually this implies future availability (e.g., a new feature of a web-service API).
502Bad GatewayThe server was acting as a gateway or proxy and received an invalid response from the upstream server.
503Service UnavailableThe server cannot handle the request (because it is overloaded or down for maintenance). Generally, this is a temporary state.
504Gateway TimeoutThe server was acting as a gateway or proxy and did not receive a timely response from the upstream server.
505HTTP Version Not SupportedThe server does not support the HTTP protocol version used in the request.
506Variant Also Negotiates (RFC 2295)Transparent content negotiation for the request results in a circular reference.
507Insufficient Storage (WebDAV; RFC 4918)The server is unable to store the representation needed to complete the request.
508Loop Detected (WebDAV; RFC 5842)The server detected an infinite loop while processing the request (sent instead of 208 Already Reported).
510Not Extended (RFC 2774)Further extensions to the request are required for the server to fulfil it.
511Network 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).

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