The HTTP status line is the term given to the HTTP status code (the actual code number) when accompanied by the HTTP reason phrase1 (the short description).
You can read more about HTTP status codes in general here. I also keep a list of HTTP status code errors (4xx and 5xx) along with some tips on how to fix them.
Note: Though technically incorrect, HTTP status lines are often referred to as simply HTTP status codes.
HTTP Status Lines (HTTP Status Codes + HTTP Reason Phrases)
| Status Code | Reason Phrase |
| 100 | Continue |
| 101 | Switching Protocols |
| 102 | Processing |
| 200 | OK |
| 201 | Created |
| 202 | Accepted |
| 203 | Non-Authoritative Information |
| 204 | No Content |
| 205 | Reset Content |
| 206 | Partial Content |
| 207 | Multi-Status |
| 300 | Multiple Choices |
| 301 | Moved Permanently |
| 302 | Found |
| 303 | See Other |
| 304 | Not Modified |
| 305 | Use Proxy |
| 307 | Temporary Redirect |
| 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 Time-out |
| 409 | Conflict |
| 410 | Gone |
| 411 | Length Required |
| 412 | Precondition Failed |
| 413 | Request Entity Too Large |
| 414 | Request-URI Too Large |
| 415 | Unsupported Media Type |
| 416 | Request Range Not Satisfiable |
| 417 | Expectation Failed |
| 422 | Unprocessable Entity |
| 423 | Locked |
| 424 | Failed Dependency |
| 425 | Unordered Collection |
| 426 | Upgrade Required |
| 500 | Internal Server Error |
| 501 | Not Implemented |
| 502 | Bad Gateway |
| 503 | Service Unavailable |
| 504 | Gateway Time-out |
| 505 | HTTP Version Not Supported |
| 506 | Variant Also Negotiates |
| 507 | Insufficient Storage |
| 510 | Not Extended |
[1] The HTTP reason phrases that accompany HTTP status codes are only recommended. A different reason phrase is allowed per RFC 2616 6.1.1. You might see HTTP reason phrases replaced with a more "friendly" description or in a local language.
