HTTP Status Codes

Successful Codes (2xx)

 200 OK

 201 Created

 202 Accepted

 203 Non-Authoritative Information

 204 No Content

 205 Reset Content

 206 Partial Content

 207 Multi-Status

 208 Already Reported

 226 IM Used

Client Error Codes (4xx)

 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 Request Range Not Satisfiable

 417 Expectation Failed

 418 I'm a teapot

 422 Unprocessable Entity

 423 Locked

 424 Failed Dependancy

 425 Unordered Collection

 426 Upgrade Required

 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

 451 Unavailable For Legal Reasons

 499 Client Closed Request

Redirection Codes (3xx)

 300 Multiple Choices

 301 Moved Permanently

 302 Found

 303 See Other

 304 Not Modified

 305 Use Proxy

 306 Switch Proxy

 307 Temporary Redirect

 308 Resume Incomplete

Server Error Codes (5xx)

 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

 507 Insufficient Storage

 508 Loop Detected

 509 Bandwidth Limit Exceeeded

 510 Not Extended

 511 Network Authentication Required

 598 Network Read Timeout Error

 599 Network Connect Timeout Error

Information Codes (1xx)

 100 Continue

 101 Switching Protocols

 102 Processing

 103 Checkpoint

 122 Request-URI too long

Credits: http://www.cheatography.com/kstep/cheat-sheets/http-status-codes/