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HTTP: The Definitive Guide, Chapter 3: HTTP Messages

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500-599: Server Error Status Codes

Sometimes a client sends a valid request, but the server itself has an error. This could be a client running into a limitation of the server or an error in one of the server's subcomponents, such as a gateway resource.

Proxies often run into problems when trying to talk to servers on a client's behalf. Proxies issue 5XX server error status codes to describe the problem (Chapter 6 covers this in detail). Table 3-10 lists the defined server error status codes.

Table 3-10: Server error status codes and reason phrases

Status code	Reason phrase	Meaning
500	Internal Server Error	Used when the server encounters an error that prevents it from servicing the request.
501	Not Implemented	Used when a client makes a request that is beyond the server's capabilities (e.g., using a request method that the server does not support).
502	Bad Gateway	Used when a server acting as a proxy or gateway encounters a bogus response from the next link in the request response chain (e.g., if it is unable to connect to its parent gateway).
503	Service Unavailable	Used to indicate that the server currently cannot service the request but will be able to in the future. If the server knows when the resource will become available, it can include a Retry-After header in the response. See "Response Headers" for more on the Retry-After header.
504	Gateway Timeout	Similar to status code 408, except that the response is coming from a gateway or proxy that has timed out waiting for a response to its request from another server.
505	HTTP Version Not Supported	Used when a server receives a request in a version of the protocol that it can't or won't support. Some server applications elect not to support older versions of the protocol.

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Created: January 29, 2003
Revised: January 29, 2003

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