The following is a list of HyperText Transfer Protocol (HTTP) response status codes. This includes codes from IETF internet standards as well as unstandardised RFCs,
other specifications and some additional commonly used codes. The first
digit of the status code specifies one of five classes of response; the
bare minimum for an HTTP client is that it recognises these five
classes. Microsoft IIS may use additional decimal sub-codes to provide more specific information,
but these are not listed here. The phrases used are the standard
examples, but any human-readable alternative can be provided. Unless
otherwise stated, the status code is part of the HTTP/1.1 standard.


