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