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Submitted by: Vincent de Lau <vincent@delau.nl> git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@96211 13f79535-47bb-0310-9956-ffa450edef68
111 lines
6.7 KiB
Plaintext
111 lines
6.7 KiB
Plaintext
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--><title>Apache's Handler Use- Apache HTTP Server</title><link href="./style/manual.css" type="text/css" rel="stylesheet"/></head><body><blockquote><div align="center"><img src="./images/sub.gif" alt="[APACHE DOCUMENTATION]"/><h3>Apache HTTP Server Version 2.0</h3></div><h1 align="center">Apache's Handler Use</h1>
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<p>This document describes the use of Apache's Handlers.</p>
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<ul><li><a href="#definition">What is a Handler</a></li><li><a href="#examples">Examples</a><ul><li><a href="#example1">Modifying static content using a CGI script</a></li><li><a href="#example2">Files with HTTP headers</a></li></ul></li><li><a href="#programmer">Programmer's Note</a></li></ul><hr/><h2><a name="definition">What is a Handler</a></h2>
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<table border="1"><tr><td valign="top"><strong>Related Modules</strong><br/><br/><code><a href="./mod/mod_actions.html">mod_actions</a></code>, <br/><code><a href="./mod/mod_asis.html">mod_asis</a></code>, <br/><code><a href="./mod/mod_cgi.html">mod_cgi</a></code>, <br/><code><a href="./mod/mod_imap.html">mod_imap</a></code>, <br/><code><a href="./mod/mod_info.html">mod_info</a></code>, <br/><code><a href="./mod/mod_mime.html">mod_mime</a></code>, <br/><code><a href="./mod/mod_negotiation.html">mod_negotiation</a></code>, <br/><code><a href="./mod/mod_status.html">mod_status</a></code><br/></td><td valign="top"><strong>Related Directives</strong><br/><br/><a href="./mod/mod_actions.html#action" class="directive"><code class="directive">Action</code></a><br/><a href="./mod/mod_mime.html#addhandler" class="directive"><code class="directive">AddHandler</code></a><br/><a href="./mod/mod_mime.html#removehandler" class="directive"><code class="directive">RemoveHandler</code></a><br/><a href="./mod/mod_mime.html#sethandler" class="directive"><code class="directive">SetHandler</code></a><br/></td></tr></table>
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<p>A "handler" is an internal Apache representation of the
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action to be performed when a file is called. Generally, files
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have implicit handlers, based on the file type. Normally, all
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files are simply served by the server, but certain file types
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are "handled" separately.</p>
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<p>Apache 1.1 adds the ability to use handlers explicitly.
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Based on either filename extensions or on location, handlers
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can be specified without relation to file type. This is
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advantageous both because it is a more elegant solution, and
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because it also allows for both a type <strong>and</strong> a
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handler to be associated with a file. (See also <a href="mod/mod_mime.html#multipleext">Files with Multiple
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Extensions</a>.)</p>
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<p>Handlers can either be built into the server or included in
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a module, or they can be added with the <a href="./mod/mod_actions.html#action" class="directive"><code class="directive">Action</code></a> directive. The
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built-in handlers in the standard distribution are as
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follows:</p>
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<ul>
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<li><strong>default-handler</strong>: Send the file using the
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<code>default_handler()</code>, which is the handler used by
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default to handle static content. (core)</li>
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<li><strong>send-as-is</strong>: Send file with HTTP headers
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as is. (<code><a href="./mod/mod_asis.html">mod_asis</a></code>)</li>
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<li><strong>cgi-script</strong>: Treat the file as a CGI
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script. (<code><a href="./mod/mod_cgi.html">mod_cgi</a></code>)</li>
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<li><strong>imap-file</strong>: Parse as an imagemap rule
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file. (<code><a href="./mod/mod_imap.html">mod_imap</a></code>)</li>
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<li><strong>server-info</strong>: Get the server's
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configuration information. (<code><a href="./mod/mod_info.html">mod_info</a></code>)</li>
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<li><strong>server-status</strong>: Get the server's status
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report. (<code><a href="./mod/mod_status.html">mod_status</a></code>)</li>
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<li><strong>type-map</strong>: Parse as a type map file for
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content negotiation. (<code><a href="./mod/mod_negotiation.html">mod_negotiation</a></code>)</li>
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</ul>
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<h2><a name="examples">Examples</a></h2>
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<h3><a name="example1">Modifying static content using a CGI script</a></h3>
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<p>The following directives will cause requests for files with
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the <code>html</code> extension to trigger the launch of the
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<code>footer.pl</code> CGI script.</p>
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<blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code><code>
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Action add-footer /cgi-bin/footer.pl<br>
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AddHandler add-footer .html
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</code></code></td></tr></table></blockquote>
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<p>Then the CGI script is responsible for sending the
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originally requested document (pointed to by the
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<code>PATH_TRANSLATED</code> environment variable) and making
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whatever modifications or additions are desired.</p>
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<h3><a name="example2">Files with HTTP headers</a></h3>
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<p>The following directives will enable the
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<code>send-as-is</code> handler, which is used for files which
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contain their own HTTP headers. All files in the
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<code>/web/htdocs/asis/</code> directory will be processed by
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the <code>send-as-is</code> handler, regardless of their
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filename extensions.</p>
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<blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code><code>
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<Directory /web/htdocs/asis><br>
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SetHandler send-as-is<br>
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</Directory>
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</code></code></td></tr></table></blockquote>
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<h2><a name="programmer">Programmer's Note</a></h2>
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<p>In order to implement the handler features, an addition has
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been made to the <a href="developer/API.html">Apache API</a> that
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you may wish to make use of. Specifically, a new record has
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been added to the <code>request_rec</code> structure:</p>
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<pre>
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char *handler
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</pre>
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<p>If you wish to have your module engage a handler, you need
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only to set <code>r->handler</code> to the name of the
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handler at any time prior to the <code>invoke_handler</code>
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stage of the request. Handlers are implemented as they were
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before, albeit using the handler name instead of a content
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type. While it is not necessary, the naming convention for
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handlers is to use a dash-separated word, with no slashes, so
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as to not invade the media type name-space.</p>
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</blockquote><h3 align="center">Apache HTTP Server Version 2.0</h3><a href="./"><img src="./images/index.gif" alt="Index"/></a><a href="./"><img src="./images/home.gif" alt="Home"/></a></body></html> |