From the HTTPD specs at ftp://ftp.isi.edu/in-notes/rfc2616.txt

The request has succeeded. The information returned with the response is dependent on the method used in the request, for example:

  • GET an entity corresponding to the requested resource is sent in the response;
  • HEAD the entity-header fields corresponding to the requested resource are sent in the response without any message body;
  • POST an entity describing or containing the result of the action;
  • TRACE an entity containing the request message as received by the end server.

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