The mechanism of the WEB - server

A Web server is a program that, using the client/server model and the World Wide Web's Hypertext Transfer Protocol (HTTP), serves the files that form Web pages to Web users (whose computers contain HTTP clients that forward their requests). Every computer on the Internet that contains a Web site must have a Web server program. Two leading Web servers are Apache, the most widely-installed Web server, and Microsoft's Internet Information Server (IIS).

Server`s functions:

· The server stores various resources (e.g. Web-pages)

· for each resource set access rights

· server handles client requests that require a particular resource

· server communicates with clients and other servers

Access scheme the client (browser) to the web site:

· in the browser address bar type the address of the site which wants to get the user (http://www.eucp.com)

· the browser sends a request special computer that is called DNS- server (Domain Name System)

· DNS- server converts the numeric address (IP- address) address of the server where the site is located (212.147.139.162) and returns it to the browser

· browser sends a request to the received address and in response receives the requested resource after the resource is transmitted, the connection between the client and server is broken