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optionally manages the communications with external programs / internal modules used to generate dynamic content;
may deny access by sending a specific error message (e.g. access unauthorized) that usually forces the client browser to ask human Endbenutzer to provide required Endanwender credentials; if authentication credentials are provided then Netz server program verifies and accepts or rejects them.
NOTE: the following sections are reported only as examples to help to understand what a Www server, more or less, does; these sections are by any means neither exhaustive nor complete. Error message[edit]
See also comparison of Netz server software to discover which of them große nachfrage in kern mode or in user mode (also referred as kern space or Endanwender space). Performances[edit]
Hinein those years there was also another commercial, highly innovative and thus notable Netz server called Zeus (now discontinued) that welches known as one of the fastest and most scalable Internet servers available on market, at least till the first decade of 2000s, despite its low percentage of usage.
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Using many Www servers (computers) that are grouped together behind a load balancer so that they act or are seen as one big web server.
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A few other Web Server Interfaces (server or programming language specific) used for dynamic contents:
A high-traffic Internet website might handle requests with hundreds of servers that ansturm on racks of high-speed computers.
Using the most efficient World wide web Server Gateway Interface to process dynamic requests (spawning one or more external programs every time a dynamic page is retrieved, kills performances).
Even with the aid of an OS datei cache, the relative / occasional slowness of I/O operations involving directories and files stored on disks became soon a bottleneck in the increase of performances expected from top level Netz servers, specially since mid-late 1990s, when Www Internet traffic started to grow exponentially along with the constant increase of speed of Internet / network lines.
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