Information on Apache Handlers

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Information on Apache Handlers
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Table of Contents

• Apache Handlers
• Built-in Handlers in Standard Distribution
• Function of Apache Handlers
• Creating an Apache Handler

• How to Remove an Apache handler?
• Modifying Static Content Using a CGI Script
• Files with HTTP Headers

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Apache Handlers

• A handler refers to an internal Apache
  representation of the action that is to be
  performed at the time when a file is called.
  Usually, files have implicit handlers, depending
  on the file type. Generally, the files are served
  by the server but there are certain types of
  files that are handled separately.
• It is possible to configure handlers explicitly,
  depending on either filename extension or on
  location, without any relation to file type.
• Handlers can either be included in a module or be
  built into the server, or these can be added with
  the Action directive.

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Built-in Handlers in Standard Distribution

• The built-in-handlers in the standard
  distribution of cPanel are mentioned below.
• default-handler - It sends the file and uses the
  default handler of Apache for static content.
• send-as-is - It sends the file with HTTP headers
  intact.
• cgi-script It handles the file as a CGI script.
• imap-file It parses the file as an imagemap
  rule file.
• server-info It retrieves the configuration
  information of the server.
• server-parsed Parses the file for server-side
  includes.
• server-status It retrieves the status report of
  the server.
• type-map Parses the file as a type map file.

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Function of Apache Handlers

• Apache handlers control the way in which a sites
  Apache web server software manages certain types
  of files and their extensions. CGI scripts and
  server-parsed files are handled by Apache. Apache
  can be configured for using an existing handler
  for the purpose of handling a new file type. For
  this purpose, you need to add manually the
  handler and the extension in the interface.
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Creating an Apache Handler

• You need to carry out the following steps for
  adding an Apache handler
• Enter the handler name in the text box, Handler.
• Enter the file extension in the text box,
  Extension(s).
• A file extension refers to the letters after the
  dot (.) in a file name.
• Space-separate multiple extensions.
• Click Add.
• It needs to be mentioned here that the interface
  does not let you create custom Apache handlers

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How to Remove an Apache handler?

• You need to carry out the following steps in
  order to remove a user-defined handler
• Click Delete, that is under the Remove heading,
  for the appropriate handler in the User Defined
  Apache Handlers table.
• Click Yes.
• It needs to be specified that you cannot remove
  those file extensions that are handled
  automatically by Apache.

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Modifying Static Content Using a CGI Script

• The below-mentioned directives will result in the
  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
• Post that, the CGI script has the responsibility
  of sending the document that was requested
  originally, which is pointed to by the
  PATH_TRANSLATED environment variable. It is also
  responsible for ensuring that the desired
  modifications or additions take place.

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Files with HTTP Headers

• The send-as-is handler gets enabled by the
  following directives
• ltDirectory "/web/htdocs/asis"gt
• SetHandler send-as-is
• lt/Directorygt
• The send-as-in handler processes all files in the
  /web/htdocs/asis/ directory, regardless of their
  filename extensions.
• .

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