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250 lines
15 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!--
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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This file is generated from xml source: DO NOT EDIT
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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-->
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<title>mod_cgi - Apache HTTP Server</title>
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<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
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<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
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<link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="../style/css/prettify.css" />
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<script src="../style/scripts/prettify.js" type="text/javascript">
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</script>
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<link href="../images/favicon.ico" rel="shortcut icon" /></head>
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<body>
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<div id="page-header">
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
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<p class="apache">Apache HTTP Server Version 2.5</p>
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<img alt="" src="../images/feather.gif" /></div>
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<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
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<div id="path">
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.5</a> > <a href="./">Modules</a></div>
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<div id="page-content">
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<div id="preamble"><h1>Apache Module mod_cgi</h1>
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<div class="toplang">
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<p><span>Available Languages: </span><a href="../en/mod/mod_cgi.html" title="English"> en </a> |
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<a href="../ja/mod/mod_cgi.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
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<a href="../ko/mod/mod_cgi.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
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</div>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Execution of CGI scripts</td></tr>
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<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Base</td></tr>
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<tr><th><a href="module-dict.html#ModuleIdentifier">Module<EFBFBD>Identifier:</a></th><td>cgi_module</td></tr>
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<tr><th><a href="module-dict.html#SourceFile">Source<EFBFBD>File:</a></th><td>mod_cgi.c</td></tr></table>
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<h3>Summary</h3>
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<p>Any file that has the handler
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<code>cgi-script</code> will be treated
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as a CGI script, and run by the server, with its output being
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returned to the client. Files acquire this handler either by
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having a name containing an extension defined by the
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<code class="directive"><a href="../mod/mod_mime.html#addhandler">AddHandler</a></code> directive, or by being
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in a <code class="directive"><a href="../mod/mod_alias.html#scriptalias">ScriptAlias</a></code>
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directory.</p>
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<p>For an introduction to using CGI scripts with Apache, see
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our tutorial on <a href="../howto/cgi.html">Dynamic Content
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With CGI</a>.</p>
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<p>When using a multi-threaded MPM under unix, the module
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<code class="module"><a href="../mod/mod_cgid.html">mod_cgid</a></code> should be used in place of
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this module. At the user level, the two modules are essentially
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identical.</p>
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<p>For backward-compatibility, the cgi-script handler will also be activated
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for any file with the mime-type <code>application/x-httpd-cgi</code>. The
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use of the magic mime-type is deprecated.</p>
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</div>
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<div id="quickview"><h3 class="directives">Directives</h3>
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<ul id="toc">
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<li><img alt="" src="../images/down.gif" /> <a href="#scriptlog">ScriptLog</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#scriptlogbuffer">ScriptLogBuffer</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#scriptloglength">ScriptLogLength</a></li>
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</ul>
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<h3>Topics</h3>
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<ul id="topics">
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<li><img alt="" src="../images/down.gif" /> <a href="#env">CGI Environment variables</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#cgi-debug">CGI Debugging</a></li>
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</ul><h3>See also</h3>
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<ul class="seealso">
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<li><code class="directive"><a href="../mod/core.html#acceptpathinfo">AcceptPathInfo</a></code></li>
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<li><code class="directive"><a href="../mod/core.html#options">Options</a></code> ExecCGI</li>
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<li><code class="directive"><a href="../mod/mod_alias.html#scriptalias">ScriptAlias</a></code></li>
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<li><code class="directive"><a href="../mod/mod_mime.html#addhandler">AddHandler</a></code></li>
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<li><a href="../suexec.html">Running CGI programs under different
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user IDs</a></li>
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<li><a href="http://www.ietf.org/rfc/rfc3875">CGI Specification</a></li>
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</ul></div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="env" id="env">CGI Environment variables</a></h2>
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<p>The server will set the CGI environment variables as described
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in the <a href="http://www.ietf.org/rfc/rfc3875">CGI specification</a>,
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with the following provisions:</p>
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<dl>
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<dt>PATH_INFO</dt>
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<dd>This will not be available if the <code class="directive"><a href="../mod/core.html#acceptpathinfo">AcceptPathInfo</a></code> directive is explicitly set to
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<code>off</code>. The default behavior, if <code class="directive">AcceptPathInfo</code> is not given, is that <code class="module"><a href="../mod/mod_cgi.html">mod_cgi</a></code> will accept path info (trailing <code>
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/more/path/info</code> following the script filename in the URI),
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while the core server will return a 404 NOT FOUND error for requests
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with additional path info. Omitting the <code class="directive">AcceptPathInfo</code> directive has the same effect as setting
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it <code>On</code> for <code class="module"><a href="../mod/mod_cgi.html">mod_cgi</a></code> requests.</dd>
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<dt>REMOTE_HOST</dt>
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<dd>This will only be set if <code class="directive"><a href="../mod/core.html#hostnamelookups">HostnameLookups</a></code> is set to <code>on</code> (it
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is off by default), and if a reverse DNS lookup of the accessing
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host's address indeed finds a host name.</dd>
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<dt>REMOTE_IDENT</dt>
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<dd>This will only be set if <code class="directive"><a href="../mod/mod_ident.html#identitycheck">IdentityCheck</a></code> is set to
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<code>on</code> and the accessing host supports the ident
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protocol. Note that the contents of this variable cannot be
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relied upon because it can easily be faked, and if there is a
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proxy between the client and the server, it is usually
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totally useless.</dd>
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<dt>REMOTE_USER</dt>
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<dd>This will only be set if the CGI script is subject to
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authentication.</dd>
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</dl>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="cgi-debug" id="cgi-debug">CGI Debugging</a></h2>
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<p>Debugging CGI scripts has traditionally been difficult, mainly
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because it has not been possible to study the output (standard
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output and error) for scripts which are failing to run
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properly. These directives provide more detailed logging of errors
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when they occur.</p>
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<h3>CGI Logfile Format</h3>
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<p>When configured, the CGI error log logs any CGI which does not
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execute properly. Each CGI script which fails to operate causes
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several lines of information to be logged. The first two lines
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are always of the format:</p>
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<div class="example"><p><code>
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%% [<var>time</var>] <var>request-line</var><br />
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%% <var>HTTP-status</var> <var>CGI-script-filename</var>
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</code></p></div>
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<p>If the error is that CGI script cannot be run, the log file
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will contain an extra two lines:</p>
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<div class="example"><p><code>
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%%error<br />
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<var>error-message</var>
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</code></p></div>
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<p>Alternatively, if the error is the result of the script
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returning incorrect header information (often due to a bug in
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the script), the following information is logged:</p>
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<div class="example"><p><code>
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%request<br />
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<var>All HTTP request headers received</var><br />
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<var>POST or PUT entity (if any)</var><br />
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%response<br />
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<var>All headers output by the CGI script</var><br />
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%stdout<br />
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<var>CGI standard output</var><br />
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%stderr<br />
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<var>CGI standard error</var><br />
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</code></p></div>
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<p>(The %stdout and %stderr parts may be missing if the script did
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not output anything on standard output or standard error).</p>
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</div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="directive-section"><h2><a name="ScriptLog" id="ScriptLog">ScriptLog</a> <a name="scriptlog" id="scriptlog">Directive</a></h2>
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<table class="directive">
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<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Location of the CGI script error logfile</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ScriptLog <var>file-path</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td><code class="module"><a href="../mod/mod_cgi.html">mod_cgi</a></code>, <code class="module"><a href="../mod/mod_cgid.html">mod_cgid</a></code></td></tr>
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</table>
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<p>The <code class="directive">ScriptLog</code> directive sets the CGI
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script error logfile. If no <code class="directive">ScriptLog</code> is given,
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no error log is created. If given, any CGI errors are logged into the
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filename given as argument. If this is a relative file or path it is
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taken relative to the <code class="directive"><a href="../mod/core.html#serverroot">ServerRoot</a></code>.
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</p>
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<div class="example"><h3>Example</h3><pre class="prettyprint lang-config">
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ScriptLog logs/cgi_log
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</pre>
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</div>
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<p>This log will be opened as the user the child processes run
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as, <em>i.e.</em> the user specified in the main <code class="directive"><a href="../mod/mod_unixd.html#user">User</a></code> directive. This means that
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either the directory the script log is in needs to be writable
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by that user or the file needs to be manually created and set
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to be writable by that user. If you place the script log in
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your main logs directory, do <strong>NOT</strong> change the
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directory permissions to make it writable by the user the child
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processes run as.</p>
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<p>Note that script logging is meant to be a debugging feature
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when writing CGI scripts, and is not meant to be activated
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continuously on running servers. It is not optimized for speed
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or efficiency, and may have security problems if used in a
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manner other than that for which it was designed.</p>
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</div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="directive-section"><h2><a name="ScriptLogBuffer" id="ScriptLogBuffer">ScriptLogBuffer</a> <a name="scriptlogbuffer" id="scriptlogbuffer">Directive</a></h2>
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<table class="directive">
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<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum amount of PUT or POST requests that will be recorded
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in the scriptlog</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ScriptLogBuffer <var>bytes</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ScriptLogBuffer 1024</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td><code class="module"><a href="../mod/mod_cgi.html">mod_cgi</a></code>, <code class="module"><a href="../mod/mod_cgid.html">mod_cgid</a></code></td></tr>
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</table>
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<p>The size of any PUT or POST entity body that is logged to
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the file is limited, to prevent the log file growing too big
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too quickly if large bodies are being received. By default, up
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to 1024 bytes are logged, but this can be changed with this
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directive.</p>
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</div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="directive-section"><h2><a name="ScriptLogLength" id="ScriptLogLength">ScriptLogLength</a> <a name="scriptloglength" id="scriptloglength">Directive</a></h2>
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<table class="directive">
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<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Size limit of the CGI script logfile</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ScriptLogLength <var>bytes</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ScriptLogLength 10385760</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td><code class="module"><a href="../mod/mod_cgi.html">mod_cgi</a></code>, <code class="module"><a href="../mod/mod_cgid.html">mod_cgid</a></code></td></tr>
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</table>
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<p><code class="directive">ScriptLogLength</code> can be used to limit the
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size of the CGI script logfile. Since the logfile logs a lot of
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information per CGI error (all request headers, all script output)
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it can grow to be a big file. To prevent problems due to unbounded
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growth, this directive can be used to set an maximum file-size for
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the CGI logfile. If the file exceeds this size, no more
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information will be written to it.</p>
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</div>
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</div>
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<div class="bottomlang">
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<p><span>Available Languages: </span><a href="../en/mod/mod_cgi.html" title="English"> en </a> |
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<a href="../ja/mod/mod_cgi.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
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<a href="../ko/mod/mod_cgi.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
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</div><div id="footer">
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<p class="apache">Copyright 2012 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p></div><script type="text/javascript"><!--//--><![CDATA[//><!--
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