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Mod qos

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mod_qos is a Quality of Service module for the Apache HTTP server implementing control mechanisms that can provide different priority to different requests.

Control mechanisms are available on two levels:

  • Request level control: mod_qos controls the number of concurrent requests to a name space (URL).
  • Connection level control: mod_qos controls the number of TCP connections to the web server.

The module is very useful when used in a reverse proxy in order to divide up resources to different webserver but also to prevent denial-of-service attack.

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