Server-side scripting

Server-side scripting is a web server technology in which a user's request is fulfilled by

running a script directly on the web server to generate dynamic HTML pages. It is

usually used to provide interactive web sites that interface to databases or other data

stores. This is different from client-side scripting where scripts are run by the viewing

web browser, usually in JavaScript. The primary advantage to server-side scripting is

the ability to highly customize the response based on the user's requirements, access

rights, or queries into data stores.

When the server serves data in a commonly used manner, for example according to the

HTTP or FTP protocols, users may have their choice of a number of client programs

(most modern web browsers can request and receive data using both of those

protocols). In the case of more specialized applications, programmers may write their

own server, client, and communications protocol, that can only be used with one

another.

Programs that run on a user's local computer without ever sending or receiving data

over a network are not considered clients, and so the operations of such programs

would not be considered client-side operations.

Explanation

In the "old" days of the web, server-side scripting was almost exclusively performed by

using a combination of C programs, Perl scripts and shell scripts using the Common

Gateway Interface (CGI). Those scripts were executed by the operating system,

mnemonic coding and the results simply served back by the web server. Nowadays,

these and other on-line scripting languages such as ASP and PHP can often be executed

directly by the web server itself or by extension modules (e.g. mod perl or mod php) to

the web server. Either form of scripting (i.e., CGI or direct execution) can be used to

build up complex multi-page sites, but direct execution usually results in lower

overhead due to the lack of calls to external interpreters.

Dynamic websites are also sometimes powered by custom web application servers, for

example the Python "Base HTTP Server" library, although some may not consider this to

be server-side scripting.

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