Appendix D
HTTP/1.1 Status Codes and Reason Phrases (IETF RFC 2616)
The status code element is a three-digit integer result code of the attempt to understand and satisfy the request. The reason phrase exists for the sole purpose of providing a textual description associated with the numeric status code, done out of deference to earlier Internet application protocols that were more frequently used with interactive text clients. A client should ignore the content of the reason phrase. The reason phrases listed are only recommendations and may be replaced by local equivalents without affecting the protocol.
The first digit of the status code defines the class of response. The last two digits do not have any categorization role. There are five values ...
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