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Web ServerThe term web server can mean one of two things: - a computer responsible for serving web pages, mostly HTML documents, via the HTTP protocol to clients, mostly web browsers;
- a software program that is working as a daemon serving web documents.
Connections to HTTP servers are made using web browsers. Common features Although web server programs differ in detail, they all share some basic common features. Every web server program operates by accepting HTTP requests from the network, and providing an HTTP response to the requester. The HTTP response typically consists of an HTML document, but can also be a raw text file, an image, or some other type of document. Path Translation Web servers translate the path component of a URI into a local file system resource. The URI path specified by the client is relative to the web server's root directory. Consider the following URI as it would be requested by a client: http://www.example.com/path/file.html The client's web browser will translate it into a connection to www.example.com with the following HTTP 1.1 request: GET /path/file.html HTTP/1.1 Host www.example.com The web server on www.example.com will append to its root path, which on a UNIX machine would commonly be /var/www/htdocs. The result will be the local file system resource: /var/www/htdocs/path/file.html The web server will then read the file, if it exists, and send a response to the client's web browser. The request will contain any appropriate headers and the file itself. Historical Note The first webserver was developed at CERN to handle the huge telephone book. It ran on a black NeXT cube, which was also used to develop the first web browser, NCSA Mosaic. Software The most common web or HTTP server programs are: Apache is by far the most common software, with over 69% market share according to the March 2005 Netcraft Web Server Survey. See for a comprehensive list of HTTP server programs. See also External links
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