W W W . W H A T I S H T T P . C O M   -  HTTP or Hyper Text Transfer Protocol (HTTP) is the communications protocol which enables browsing the Web.

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History
Up to this moment there are three HTTP versions.
- the first was HTTP/0.9 - used since 1990 - not specified as a standard
- the second was HTTP/1.0 - developed 1992-1996 and it became official in May 1996 - RFC 1945
- and the HTTP/1.1 - RFC 2068
Characteristics
Is Stateless which means that every transaction which is made between a certain client and a server is independent and no state information is set based on a previous condition or transaction.
Is based on requests from a client to a server and responses from the server (which received the request) to the client (waiting for an answer).
Error codes
100 - Continue
101 - Switching Protocols
200 - OK
201 - Created
202 - Accepted
203 - Non-Authoritative Information
204 - No Content
205 - Reset Content
206 - Partial Content
300 - Multiple Choices
301 - Moved Permanently
302 - Moved Temporarily
303 - See Other
304 - Not Modified
305 - Use Proxy
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-URL Too Large
415 - Unsupported Media Type
500 - Server Error
501 - Not Implemented
502 - Bad Gateway
503 - Out of Resources
504 - Gateway Time-Out
505 - HTTP Version not supported

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