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HTTP, Hypertext Transfer Protocol, is the method by which clients (i.e. you) and servers communicate. When someone clicks a link, types in a URL or submits out a form, their browser sends a request to a server for information. It might be asking for a page, or sending data, but either way, that is called an HTTP Request. When a server receives that request, it sends back an HTTP Response, with information for the client. Usually, this is invisible, though I'm sure you've seen one of the very common Response codes - 404, indicating a page was not found. There are a fair few more status codes sent by servers, and the following is a list of the current ones in HTTP 1.1, along with an explanation of their meanings.

Status CodesEdit

100 - Continue

101 - Switching Protocols Successful

200 - OK 

201 - Created

202 - Accepted

203 - Non-Authoritative Information

204 - No Content

205 - Reset Content

206 - Partial Content

Redirection

300 - Multiple Choices

301 - Moved Permanently

302 - Found

303 - See Other

304 - Not Modified

305 - Use Proxy

307 - Temporary Redirect

Client Error

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

Server Error 5xx

500 Internal Server Error

501 Not Implemented

502 Bad Gateway

503 Service Unavailable

504 Gateway Timeout

505 HTTP Version Not Supported