HTTP (Hypertext Transfer Protocol) status codes

Have a look at RFC 2616 for full specification of the HTTP protocol.
All the detailed HTTP status codes definitions can be found in section 10.1.1 (page 57) in the above document.

1xx Informational

Code	Info
100	Continue
101	Switching Protocols
102	Processing (WebDAV) (RFC 2518)
103	Checkpoint
122	Request-URI too long

2xx Success

Code	Info
200	OK
201	Created
202	Accepted
203	Non-Authoritative Information (since HTTP/1.1)
204	No Content
205	Reset Content
206	Partial Content
207	Multi-Status (WebDAV) (RFC 4918)
208	Already Reported (WebDAV) (RFC 5842)
226	IM Used (RFC 3229)

3xx Redirection

Code	Info
300	Multiple Choices
301	Moved Permanently
302	Found
303	See Other (since HTTP/1.1)
304	Not Modified
305	Use Proxy (since HTTP/1.1)
306	Switch Proxy
307	Temporary Redirect (since HTTP/1.1)
308	Resume Incomplete

4xx Client Error

Code	Info
400	Bad Request
401	Unauthorized
402	Payment Required
403	Forbidden
404	Not Found
405	Method Not Allowed
406	Not Acceptable
407	Proxy Authentication Required
408	Request Timeout
409	Conflict
410	Gone
411	Length Required
412	Precondition Failed
413	Request Entity Too Large
414	Request-URI Too Long
415	Unsupported Media Type
416	Requested Range Not Satisfiable
417	Expectation Failed
418	I'm a teapot (RFC 2324)
420	Enhance Your Calm
422	Unprocessable Entity (WebDAV) (RFC 4918)
423	Locked (WebDAV) (RFC 4918)
424	Failed Dependency (WebDAV) (RFC 4918)
425	Unordered Collection (RFC 3648)
426	Upgrade Required (RFC 2817)
428	Precondition Required
429	Too Many Requests
431	Request Header Fields Too Large
444	No Response
449	Retry With
450	Blocked by Windows Parental Controls
499	Client Closed Request

5xx Server Error

Code	Info
500	Internal Server Error
501	Not Implemented
502	Bad Gateway
503	Service Unavailable
504	Gateway Timeout
505	HTTP Version Not Supported
506	Variant Also Negotiates (RFC 2295)
507	Insufficient Storage (WebDAV) (RFC 4918)
508	Loop Detected (WebDAV) (RFC 5842)
509	Bandwidth Limit Exceeded (Apache bw/limited extension)
510	Not Extended (RFC 2774)
511	Network Authentication Required
598	Network read timeout error
599	Network connect timeout error

Document version: 1.0

Last modified on: 14th March 2012