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HTTP

(computer science)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

HTTP

This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

HTTP

(HyperText Transfer Protocol) The communications protocol used to connect to Web servers on the Internet or on a local network (intranet). The primary function of HTTP is to establish a connection with the server and send HTML pages back to the user's browser. It is also used to download data from the server either to the browser or to any requesting application that uses HTTP.

Addresses of websites begin with an http:// prefix; however, Web browsers typically default to the HTTP protocol. For example, typing www.yahoo.com is the same as typing http://www.yahoo.com. In fact, only yahoo.com has to be typed in. The browser adds the rest.

HTTPS
HTTPS (HTTP Secure) is the encrypted version of HTTP (see HTTPS).

A Stateless Connection
HTTP is a "stateless" request/response system. The connection is maintained between client and server only for the immediate request, and the connection is closed. After the HTTP client establishes a TCP connection with the server and sends it a request command, the server sends back its response and closes the connection.

The first version of HTTP caused considerable overhead. Each time a graphics file on the page was requested, a new protocol connection had to be established between the browser and the server. In HTTP Version 1.1, multiple files could be downloaded with the same connection. It also improved caching and made it easier to create virtual hosts (multiple websites on the same server). See HTTP/2, HTTP header and cookie.


Web Server Fundamentals
Web browsers communicate with Web servers via the TCP/IP protocol. The browser sends HTTP requests to the server, which responds by sending back headers (messages) and files (HTML pages, image files, Java applets, etc.). See HTTP header.
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