What is HTTP?

???? ?? ?????? ???? ??? ??? ????????? ???? ??????? ???? ?? ???? ????? ? ???? ???? ???? ????? ???? ????? ?????? ? ??? ????? ?? url .

? ??? ?? ??? ????????? ?? HTTP ? ????? ???? ?? ????? ??? ?????? ???? ???? ????? ????

?? ?? WWW ( World Wide Web) ? ????? ???? Web ? ?? ????? ?? ???? ????????? ???? ??? ????? ?? web pages ?? ?? resourses ?????

Url ??? ???? ? ?? ???? ???????? ????? ?????? ?? ???? ?? Web Browser

????? ??? ??? ??? ??HTTP ???? ?? ????? ?? resourses ?? ??????.

??? ?? ??? ?? HTTP ?

?? ?????? ? Hypertext Transfer Protocol ? ?? ?????????? ??????? ???? ?????? ???? ??WWW ??? ??????? ? ??? ???????? ??? ?? clients & servers? ???????? ??? ??? ????? ????? ????? ?????? ????????? ????? ?????? ?? ?????.

? ?? ?? ???? ??? ??????? ? ?? ???? ????? ???? ?? clients' request ????? ??server ???server's response ????? ???? ?? ???.

• ?stateless protocol ---> ???? ???? ?? ?????? ??? 2 requests ??????? ??? ??? ? ??????? ?? request ???????? session ????? , ? ???? ?? ?? ???? ????? ? ????? ????? ????? ????? ??? ??performance.?
• HTTP Cookie (web cookie, browser cookie) ---> ????? ?? ??????? ???? ????, ????? ?? small piece of data ?? server ??????? ?? user's browser ?? ?? browser ??????? ? ????? ?????? ???? ?? ?? request ???? ??server ,? ??????? ??server ????? ??? ?? requests ???? ?? user ????? .

? ??????? ?? :

• Session Management: Logins, shopping carts, game scores, or anything else the server should remember.
• Personalization: User preferences, themes, and other settings.
• Tracking: Recording and analyzing user behavior.

HTTP Messages : ?? ??????? ???? ?????? ?????? ???? ??? ??server ? ?? client

? ???? ????? : request , response

? ??????? ???? ??? ?? structure???

• A start-line describing the requests to be implemented, or its status of whether successful or a failure, is always a single line.
• An optional set of HTTP headers specifying the request, or describing the body included in the message.
• A blank line indicating all meta-information for the request has been sent.
• An optional body containing data associated with the request (like the content of an HTML form), or the document associated with a response. The presence of the body and its size is specified by the start-line and HTTP headers.

??? ??? ???? ? ????? ?????? ??????? ? ????????

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