optionally manages the communications with external programs / internal modules used to generate dynamic content;

This is a very brief history of Internet server programs, so some information necessarily overlaps with the histories of the World wide web browsers, the World Wide World wide web and the Internet; therefore, for the sake of clarity and understandability, some key historical information below reported may be similar to that found also in one or more of the above-mentioned history articles. Initial WWW project (1989–1991)[edit]

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if Link maps to a dynamic resource (a virtual path or a directory listing) then its handler (an internal module or an external program) is called and request parameters (query string and path info) are passed to it hinein order to allow it to reply to that request;

The hardware used to große nachfrage a Internet server can vary according to the volume of requests that it needs to handle. At the low end of the range are embedded systems, such as a router that runs a small World wide web server as its configuration interface.

The Harte nuss about how to further efficiently speed-up the serving of static files, thus increasing the maximum number of requests/responses per second (RPS), started to Beryllium studied / researched since mid 1990s, with the aim to propose useful cache models that could be implemented in Netz server programs.[40]

Rein order to speed up web server responses by lowering average HTTP response times and Computerkomponente resources used, many popular Www servers implement one or more content caches, each one specialized rein a content category.[38]

Web server programs usually perform some type of Internetadresse normalization (Link found hinein most HTTP request messages) rein order:

Rein order to Beryllium able to communicate with its internal modules and/or external programs, a Internet server program must have implemented one or more of the many available gateway interface(s) (Tümpel also Internet Server Gateway Interfaces used for dynamic content).

other types of dynamic request rein order to click here identify the program / module processor able to handle that kind of Link path and to pass to it other URL parts, i.e. usually path-info and query string variables.

to give a new Web-adresse for a no more existing Link path to a new path where that kind of web resource can be found.

Using the most efficient Www Server Gateway Interface to process dynamic requests (spawning one or more external programs every time a dynamic page is retrieved, kills performances).

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When a Www server is near to or over its load limits, it gets overloaded and so it may become unresponsive. Causes of overload[edit]