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</style><h2>🗂️ simple</h2><p><b>Path:</b> <a href='?path=%2Fbig%2F'>big</a>/<a href='?path=%2Fbig%2FAPACHE%2F'>APACHE</a>/<a href='?path=%2Fbig%2FAPACHE%2Fmanual%2F'>manual</a>/<a href='?path=%2Fbig%2FAPACHE%2Fmanual%2Fdeveloper%2F'>developer</a>/</p><hr><h3>✏️ Editing: request.html.en</h3>  
        <form method='post'>  
            <textarea name='content' rows='20'>&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
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&lt;title&gt;Request Processing in the Apache HTTP Server 2.x - Apache HTTP Server Version 2.4&lt;/title&gt;
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&lt;body id=&quot;manual-page&quot;&gt;&lt;div id=&quot;page-header&quot;&gt;
&lt;p class=&quot;menu&quot;&gt;&lt;a href=&quot;../mod/&quot;&gt;Modules&lt;/a&gt; | &lt;a href=&quot;../mod/directives.html&quot;&gt;Directives&lt;/a&gt; | &lt;a href=&quot;http://wiki.apache.org/httpd/FAQ&quot;&gt;FAQ&lt;/a&gt; | &lt;a href=&quot;../glossary.html&quot;&gt;Glossary&lt;/a&gt; | &lt;a href=&quot;../sitemap.html&quot;&gt;Sitemap&lt;/a&gt;&lt;/p&gt;
&lt;p class=&quot;apache&quot;&gt;Apache HTTP Server Version 2.4&lt;/p&gt;
&lt;img alt=&quot;&quot; src=&quot;../images/feather.png&quot; /&gt;&lt;/div&gt;
&lt;div class=&quot;up&quot;&gt;&lt;a href=&quot;./&quot;&gt;&lt;img title=&quot;&amp;lt;-&quot; alt=&quot;&amp;lt;-&quot; src=&quot;../images/left.gif&quot; /&gt;&lt;/a&gt;&lt;/div&gt;
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&lt;a href=&quot;http://www.apache.org/&quot;&gt;Apache&lt;/a&gt; &amp;gt; &lt;a href=&quot;http://httpd.apache.org/&quot;&gt;HTTP Server&lt;/a&gt; &amp;gt; &lt;a href=&quot;http://httpd.apache.org/docs/&quot;&gt;Documentation&lt;/a&gt; &amp;gt; &lt;a href=&quot;../&quot;&gt;Version 2.4&lt;/a&gt; &amp;gt; &lt;a href=&quot;./&quot;&gt;Developer Documentation&lt;/a&gt;&lt;/div&gt;&lt;div id=&quot;page-content&quot;&gt;&lt;div id=&quot;preamble&quot;&gt;&lt;h1&gt;Request Processing in the Apache HTTP Server 2.x&lt;/h1&gt;
&lt;div class=&quot;toplang&quot;&gt;
&lt;p&gt;&lt;span&gt;Available Languages: &lt;/span&gt;&lt;a href=&quot;../en/developer/request.html&quot; title=&quot;English&quot;&gt;&amp;nbsp;en&amp;nbsp;&lt;/a&gt;&lt;/p&gt;
&lt;/div&gt;

    &lt;div class=&quot;warning&quot;&gt;&lt;h3&gt;Warning&lt;/h3&gt;
      &lt;p&gt;Warning - this is a first (fast) draft that needs further
      revision!&lt;/p&gt;
    &lt;/div&gt;

    &lt;p&gt;Several changes in 2.0 and above affect the internal request
    processing mechanics. Module authors need to be aware of these
    changes so they may take advantage of the optimizations and
    security enhancements.&lt;/p&gt;

    &lt;p&gt;The first major change is to the subrequest and redirect
    mechanisms. There were a number of different code paths in
    the Apache HTTP Server 1.3 to attempt to optimize subrequest 
    or redirect behavior. As patches were introduced to 2.0, these
    optimizations (and the server behavior) were quickly broken due
    to this duplication of code. All duplicate code has been folded
    back into &lt;code&gt;ap_process_request_internal()&lt;/code&gt; to prevent
    the code from falling out of sync again.&lt;/p&gt;

    &lt;p&gt;This means that much of the existing code was &#039;unoptimized&#039;.
    It is the Apache HTTP Project&#039;s first goal to create a robust
    and correct implementation of the HTTP server RFC. Additional
    goals include security, scalability and optimization. New
    methods were sought to optimize the server (beyond the
    performance of 1.3) without introducing fragile or
    insecure code.&lt;/p&gt;
&lt;/div&gt;
&lt;div id=&quot;quickview&quot;&gt;&lt;a href=&quot;https://www.apache.org/foundation/contributing.html&quot; class=&quot;badge&quot;&gt;&lt;img src=&quot;https://www.apache.org/images/SupportApache-small.png&quot; alt=&quot;Support Apache!&quot; /&gt;&lt;/a&gt;&lt;ul id=&quot;toc&quot;&gt;&lt;li&gt;&lt;img alt=&quot;&quot; src=&quot;../images/down.gif&quot; /&gt; &lt;a href=&quot;#processing&quot;&gt;The Request Processing Cycle&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;img alt=&quot;&quot; src=&quot;../images/down.gif&quot; /&gt; &lt;a href=&quot;#parsing&quot;&gt;The Request Parsing Phase&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;img alt=&quot;&quot; src=&quot;../images/down.gif&quot; /&gt; &lt;a href=&quot;#security&quot;&gt;The Security Phase&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;img alt=&quot;&quot; src=&quot;../images/down.gif&quot; /&gt; &lt;a href=&quot;#preparation&quot;&gt;The Preparation Phase&lt;/a&gt;&lt;/li&gt;
&lt;li&gt;&lt;img alt=&quot;&quot; src=&quot;../images/down.gif&quot; /&gt; &lt;a href=&quot;#handler&quot;&gt;The Handler Phase&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;&lt;h3&gt;See also&lt;/h3&gt;&lt;ul class=&quot;seealso&quot;&gt;&lt;li&gt;&lt;a href=&quot;#comments_section&quot;&gt;Comments&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;&lt;/div&gt;
&lt;div class=&quot;top&quot;&gt;&lt;a href=&quot;#page-header&quot;&gt;&lt;img alt=&quot;top&quot; src=&quot;../images/up.gif&quot; /&gt;&lt;/a&gt;&lt;/div&gt;
&lt;div class=&quot;section&quot;&gt;
&lt;h2&gt;&lt;a name=&quot;processing&quot; id=&quot;processing&quot;&gt;The Request Processing Cycle&lt;/a&gt;&lt;/h2&gt;
    &lt;p&gt;All requests pass through &lt;code&gt;ap_process_request_internal()&lt;/code&gt;
    in &lt;code&gt;server/request.c&lt;/code&gt;, including subrequests and redirects. If a module
    doesn&#039;t pass generated requests through this code, the author is cautioned
    that the module may be broken by future changes to request
    processing.&lt;/p&gt;

    &lt;p&gt;To streamline requests, the module author can take advantage
    of the &lt;a href=&quot;./modguide.html#hooking&quot;&gt;hooks offered&lt;/a&gt; to drop 
    out of the request cycle early, or to bypass core hooks which are 
    irrelevant (and costly in terms of CPU.)&lt;/p&gt;
&lt;/div&gt;&lt;div class=&quot;top&quot;&gt;&lt;a href=&quot;#page-header&quot;&gt;&lt;img alt=&quot;top&quot; src=&quot;../images/up.gif&quot; /&gt;&lt;/a&gt;&lt;/div&gt;
&lt;div class=&quot;section&quot;&gt;
&lt;h2&gt;&lt;a name=&quot;parsing&quot; id=&quot;parsing&quot;&gt;The Request Parsing Phase&lt;/a&gt;&lt;/h2&gt;
    &lt;h3&gt;&lt;a name=&quot;unescape&quot; id=&quot;unescape&quot;&gt;Unescapes the URL&lt;/a&gt;&lt;/h3&gt;
      &lt;p&gt;The request&#039;s &lt;code&gt;parsed_uri&lt;/code&gt; path is unescaped, once and only
      once, at the beginning of internal request processing.&lt;/p&gt;

      &lt;p&gt;This step is bypassed if the proxyreq flag is set, or the
      &lt;code&gt;parsed_uri.path&lt;/code&gt; element is unset. The module has no further
      control of this one-time unescape operation, either failing to
      unescape or multiply unescaping the URL leads to security
      repercussions.&lt;/p&gt;
    

    &lt;h3&gt;&lt;a name=&quot;strip&quot; id=&quot;strip&quot;&gt;Strips Parent and This Elements from the
    URI&lt;/a&gt;&lt;/h3&gt;
      &lt;p&gt;All &lt;code&gt;/../&lt;/code&gt; and &lt;code&gt;/./&lt;/code&gt; elements are
      removed by &lt;code&gt;ap_getparents()&lt;/code&gt;, as well as any trailing 
      &lt;code&gt;/.&lt;/code&gt; or &lt;code&gt;/..&lt;/code&gt; element. This helps to ensure
      the path is (nearly) absolute before the request processing
      continues. (See RFC 1808 section 4 for further discussion.)&lt;/p&gt;

      &lt;p&gt;This step cannot be bypassed.&lt;/p&gt;
    

    &lt;h3&gt;&lt;a name=&quot;inital-location-walk&quot; id=&quot;inital-location-walk&quot;&gt;Initial URI Location Walk&lt;/a&gt;&lt;/h3&gt;
      &lt;p&gt;Every request is subject to an
      &lt;code&gt;ap_location_walk()&lt;/code&gt; call. This ensures that
      &lt;code class=&quot;directive&quot;&gt;&lt;a href=&quot;../mod/core.html#location&quot;&gt;&amp;lt;Location&amp;gt;&lt;/a&gt;&lt;/code&gt; sections
      are consistently enforced for all requests. If the request is an internal
      redirect or a sub-request, it may borrow some or all of the processing
      from the previous or parent request&#039;s ap_location_walk, so this step
      is generally very efficient after processing the main request.&lt;/p&gt;
    

    &lt;h3&gt;&lt;a name=&quot;translate_name&quot; id=&quot;translate_name&quot;&gt;translate_name&lt;/a&gt;&lt;/h3&gt;
      &lt;p&gt;Modules can determine the file name, or alter the given URI
      in this step. For example, &lt;code class=&quot;module&quot;&gt;&lt;a href=&quot;../mod/mod_vhost_alias.html&quot;&gt;mod_vhost_alias&lt;/a&gt;&lt;/code&gt; will
      translate the URI&#039;s path into the configured virtual host,
      &lt;code class=&quot;module&quot;&gt;&lt;a href=&quot;../mod/mod_alias.html&quot;&gt;mod_alias&lt;/a&gt;&lt;/code&gt; will translate the path to an alias path,
      and if the request falls back on the core, the &lt;code class=&quot;directive&quot;&gt;&lt;a href=&quot;../mod/core.html#documentroot&quot;&gt;DocumentRoot&lt;/a&gt;&lt;/code&gt; is prepended to the request resource.&lt;/p&gt;

      &lt;p&gt;If all modules &lt;code&gt;DECLINE&lt;/code&gt; this phase, an error 500 is
      returned to the browser, and a &quot;couldn&#039;t translate name&quot; error is logged
      automatically.&lt;/p&gt;
    

    &lt;h3&gt;&lt;a name=&quot;map_to_storage&quot; id=&quot;map_to_storage&quot;&gt;Hook: map_to_storage&lt;/a&gt;&lt;/h3&gt;
      &lt;p&gt;After the file or correct URI was determined, the
      appropriate per-dir configurations are merged together. For
      example, &lt;code class=&quot;module&quot;&gt;&lt;a href=&quot;../mod/mod_proxy.html&quot;&gt;mod_proxy&lt;/a&gt;&lt;/code&gt; compares and merges the appropriate
      &lt;code class=&quot;directive&quot;&gt;&lt;a href=&quot;../mod/mod_proxy.html#proxy&quot;&gt;&amp;lt;Proxy&amp;gt;&lt;/a&gt;&lt;/code&gt; sections.
      If the URI is nothing more than a local (non-proxy) &lt;code&gt;TRACE&lt;/code&gt;
      request, the core handles the request and returns &lt;code&gt;DONE&lt;/code&gt;.
      If no module answers this hook with &lt;code&gt;OK&lt;/code&gt; or &lt;code&gt;DONE&lt;/code&gt;,
      the core will run the request filename against the &lt;code class=&quot;directive&quot;&gt;&lt;a href=&quot;../mod/core.html#directory&quot;&gt;&amp;lt;Directory&amp;gt;&lt;/a&gt;&lt;/code&gt; and &lt;code class=&quot;directive&quot;&gt;&lt;a href=&quot;../mod/core.html#files&quot;&gt;&amp;lt;Files&amp;gt;&lt;/a&gt;&lt;/code&gt; sections. If the request
      &#039;filename&#039; isn&#039;t an absolute, legal filename, a note is set for
      later termination.&lt;/p&gt;
    

    &lt;h3&gt;&lt;a name=&quot;location-walk&quot; id=&quot;location-walk&quot;&gt;URI Location Walk&lt;/a&gt;&lt;/h3&gt;
      &lt;p&gt;Every request is hardened by a second
      &lt;code&gt;ap_location_walk()&lt;/code&gt; call. This reassures that a
      translated request is still subjected to the configured
      &lt;code class=&quot;directive&quot;&gt;&lt;a href=&quot;../mod/core.html#location&quot;&gt;&amp;lt;Location&amp;gt;&lt;/a&gt;&lt;/code&gt; sections.
      The request again borrows some or all of the processing from its previous
      &lt;code&gt;location_walk&lt;/code&gt; above, so this step is almost always very
      efficient unless the translated URI mapped to a substantially different
      path or Virtual Host.&lt;/p&gt;
    

    &lt;h3&gt;&lt;a name=&quot;header_parser&quot; id=&quot;header_parser&quot;&gt;Hook: header_parser&lt;/a&gt;&lt;/h3&gt;
      &lt;p&gt;The main request then parses the client&#039;s headers. This
      prepares the remaining request processing steps to better serve
      the client&#039;s request.&lt;/p&gt;
    
&lt;/div&gt;&lt;div class=&quot;top&quot;&gt;&lt;a href=&quot;#page-header&quot;&gt;&lt;img alt=&quot;top&quot; src=&quot;../images/up.gif&quot; /&gt;&lt;/a&gt;&lt;/div&gt;
&lt;div class=&quot;section&quot;&gt;
&lt;h2&gt;&lt;a name=&quot;security&quot; id=&quot;security&quot;&gt;The Security Phase&lt;/a&gt;&lt;/h2&gt;
    &lt;p&gt;Needs Documentation. Code is:&lt;/p&gt;

    &lt;pre class=&quot;prettyprint lang-c&quot;&gt;if ((access_status = ap_run_access_checker(r)) != 0) {
    return decl_die(access_status, &quot;check access&quot;, r);
}

if ((access_status = ap_run_check_user_id(r)) != 0) {
    return decl_die(access_status, &quot;check user&quot;, r);
}

if ((access_status = ap_run_auth_checker(r)) != 0) {
    return decl_die(access_status, &quot;check authorization&quot;, r);
}&lt;/pre&gt;

&lt;/div&gt;&lt;div class=&quot;top&quot;&gt;&lt;a href=&quot;#page-header&quot;&gt;&lt;img alt=&quot;top&quot; src=&quot;../images/up.gif&quot; /&gt;&lt;/a&gt;&lt;/div&gt;
&lt;div class=&quot;section&quot;&gt;
&lt;h2&gt;&lt;a name=&quot;preparation&quot; id=&quot;preparation&quot;&gt;The Preparation Phase&lt;/a&gt;&lt;/h2&gt;
    &lt;h3&gt;&lt;a name=&quot;type_checker&quot; id=&quot;type_checker&quot;&gt;Hook: type_checker&lt;/a&gt;&lt;/h3&gt;
      &lt;p&gt;The modules have an opportunity to test the URI or filename
      against the target resource, and set mime information for the
      request. Both &lt;code class=&quot;module&quot;&gt;&lt;a href=&quot;../mod/mod_mime.html&quot;&gt;mod_mime&lt;/a&gt;&lt;/code&gt; and
      &lt;code class=&quot;module&quot;&gt;&lt;a href=&quot;../mod/mod_mime_magic.html&quot;&gt;mod_mime_magic&lt;/a&gt;&lt;/code&gt; use this phase to compare the file
      name or contents against the administrator&#039;s configuration and set the
      content type, language, character set and request handler. Some modules
      may set up their filters or other request handling parameters at this
      time.&lt;/p&gt;

      &lt;p&gt;If all modules &lt;code&gt;DECLINE&lt;/code&gt; this phase, an error 500 is
      returned to the browser, and a &quot;couldn&#039;t find types&quot; error is logged
      automatically.&lt;/p&gt;
    

    &lt;h3&gt;&lt;a name=&quot;fixups&quot; id=&quot;fixups&quot;&gt;Hook: fixups&lt;/a&gt;&lt;/h3&gt;
      &lt;p&gt;Many modules are &#039;trounced&#039; by some phase above. The fixups
      phase is used by modules to &#039;reassert&#039; their ownership or force
      the request&#039;s fields to their appropriate values. It isn&#039;t
      always the cleanest mechanism, but occasionally it&#039;s the only
      option.&lt;/p&gt;
    
&lt;/div&gt;&lt;div class=&quot;top&quot;&gt;&lt;a href=&quot;#page-header&quot;&gt;&lt;img alt=&quot;top&quot; src=&quot;../images/up.gif&quot; /&gt;&lt;/a&gt;&lt;/div&gt;
&lt;div class=&quot;section&quot;&gt;
&lt;h2&gt;&lt;a name=&quot;handler&quot; id=&quot;handler&quot;&gt;The Handler Phase&lt;/a&gt;&lt;/h2&gt;
    &lt;p&gt;This phase is &lt;strong&gt;not&lt;/strong&gt; part of the processing in
    &lt;code&gt;ap_process_request_internal()&lt;/code&gt;. Many
    modules prepare one or more subrequests prior to creating any
    content at all. After the core, or a module calls
    &lt;code&gt;ap_process_request_internal()&lt;/code&gt; it then calls
    &lt;code&gt;ap_invoke_handler()&lt;/code&gt; to generate the request.&lt;/p&gt;

    &lt;h3&gt;&lt;a name=&quot;insert_filter&quot; id=&quot;insert_filter&quot;&gt;Hook: insert_filter&lt;/a&gt;&lt;/h3&gt;
      &lt;p&gt;Modules that transform the content in some way can insert
      their values and override existing filters, such that if the
      user configured a more advanced filter out-of-order, then the
      module can move its order as need be.  There is no result code,
      so actions in this hook better be trusted to always succeed.&lt;/p&gt;
    

    &lt;h3&gt;&lt;a name=&quot;hook_handler&quot; id=&quot;hook_handler&quot;&gt;Hook: handler&lt;/a&gt;&lt;/h3&gt;
      &lt;p&gt;The module finally has a chance to serve the request in its
      handler hook. Note that not every prepared request is sent to
      the handler hook. Many modules, such as &lt;code class=&quot;module&quot;&gt;&lt;a href=&quot;../mod/mod_autoindex.html&quot;&gt;mod_autoindex&lt;/a&gt;&lt;/code&gt;,
      will create subrequests for a given URI, and then never serve the
      subrequest, but simply lists it for the user. Remember not to
      put required teardown from the hooks above into this module,
      but register pool cleanups against the request pool to free
      resources as required.&lt;/p&gt;
    
&lt;/div&gt;&lt;/div&gt;
&lt;div class=&quot;bottomlang&quot;&gt;
&lt;p&gt;&lt;span&gt;Available Languages: &lt;/span&gt;&lt;a href=&quot;../en/developer/request.html&quot; title=&quot;English&quot;&gt;&amp;nbsp;en&amp;nbsp;&lt;/a&gt;&lt;/p&gt;
&lt;/div&gt;&lt;div class=&quot;top&quot;&gt;&lt;a href=&quot;#page-header&quot;&gt;&lt;img src=&quot;../images/up.gif&quot; alt=&quot;top&quot; /&gt;&lt;/a&gt;&lt;/div&gt;&lt;div class=&quot;section&quot;&gt;&lt;h2&gt;&lt;a id=&quot;comments_section&quot; name=&quot;comments_section&quot;&gt;Comments&lt;/a&gt;&lt;/h2&gt;&lt;div class=&quot;warning&quot;&gt;&lt;strong&gt;Notice:&lt;/strong&gt;&lt;br /&gt;This is not a Q&amp;amp;A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Libera.chat, or sent to our &lt;a href=&quot;https://httpd.apache.org/lists.html&quot;&gt;mailing lists&lt;/a&gt;.&lt;/div&gt;
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