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Apache's Handler Use - Apache HTTP Server Version 2.4








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Apache > HTTP Server > Documentation > Version 2.4Apache's Handler Use

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    This document describes the use of Apache's Handlers.
  
 What is a Handler
 Examples
 Programmer's Note
See alsoComments


What is a Handler
    
    Related ModulesRelated Directivesmod_actionsmod_asismod_cgimod_imagemapmod_infomod_mimemod_negotiationmod_statusActionAddHandlerRemoveHandlerSetHandler


    A "handler" is an internal Apache representation of the
    action to be performed when a file is called. Generally, files
    have implicit handlers, based on the file type. Normally, all
    files are simply served by the server, but certain file types
    are "handled" separately.

    Handlers may also be configured explicitly,
    based on either filename extensions or on location,
    without relation to file type. This is
    advantageous both because it is a more elegant solution, and
    because it also allows for both a type and a
    handler to be associated with a file. (See also Files with Multiple
    Extensions.)

    Handlers can either be built into the server or included in
    a module, or they can be added with the Action directive. The
    built-in handlers in the standard distribution are as
    follows:

    
      default-handler: Send the file using the
      default_handler(), which is the handler used by
      default to handle static content. (core)

      send-as-is: Send file with HTTP headers
      as is. (mod_asis)

      cgi-script: Treat the file as a CGI
      script. (mod_cgi)

      imap-file: Parse as an imagemap rule
      file. (mod_imagemap)

      server-info: Get the server's
      configuration information. (mod_info)

      server-status: Get the server's status
      report. (mod_status)

      type-map: Parse as a type map file for
      content negotiation. (mod_negotiation)
    
  

Examples
    

    Modifying static content using a CGI script
      

      The following directives will cause requests for files with
      the html extension to trigger the launch of the
      footer.pl CGI script.

      Action add-footer /cgi-bin/footer.pl
AddHandler add-footer .html


      Then the CGI script is responsible for sending the
      originally requested document (pointed to by the
      PATH_TRANSLATED environment variable) and making
      whatever modifications or additions are desired.

    
    Files with HTTP headers
      

      The following directives will enable the
      send-as-is handler, which is used for files which
      contain their own HTTP headers. All files in the
      /web/htdocs/asis/ directory will be processed by
      the send-as-is handler, regardless of their
      filename extensions.

      <Directory "/web/htdocs/asis">
    SetHandler send-as-is
</Directory>


    
  

Programmer's Note
    

    In order to implement the handler features, an addition has
    been made to the Apache API that
    you may wish to make use of. Specifically, a new record has
    been added to the request_rec structure:

    char *handler


    If you wish to have your module engage a handler, you need
    only to set r->handler to the name of the
    handler at any time prior to the invoke_handler
    stage of the request. Handlers are implemented as they were
    before, albeit using the handler name instead of a content
    type. While it is not necessary, the naming convention for
    handlers is to use a dash-separated word, with no slashes, so
    as to not invade the media type name-space.
  

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