mirror of
https://github.com/apache/httpd.git
synced 2025-11-03 17:53:20 +03:00
f88b50dec4
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@91116 13f79535-47bb-0310-9956-ffa450edef68
219 lines
8.5 KiB
HTML
219 lines
8.5 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
|
|
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
|
|
<html xmlns="http://www.w3.org/1999/xhtml">
|
|
<head>
|
|
<meta name="generator" content="HTML Tidy, see www.w3.org" />
|
|
|
|
<title>Apache module mod_cgi</title>
|
|
</head>
|
|
<!-- Background white, links blue (unvisited), navy (visited), red (active) -->
|
|
|
|
<body bgcolor="#FFFFFF" text="#000000" link="#0000FF"
|
|
vlink="#000080" alink="#FF0000">
|
|
<!--#include virtual="header.html" -->
|
|
|
|
<h1 align="CENTER">Module mod_cgi</h1>
|
|
|
|
<p>This module provides for execution of CGI scripts.</p>
|
|
|
|
<p><a href="module-dict.html#Status"
|
|
rel="Help"><strong>Status:</strong></a> Base<br />
|
|
<a href="module-dict.html#SourceFile"
|
|
rel="Help"><strong>Source File:</strong></a> mod_cgi.c<br />
|
|
<a href="module-dict.html#ModuleIdentifier"
|
|
rel="Help"><strong>Module Identifier:</strong></a>
|
|
cgi_module</p>
|
|
|
|
<h2>Summary</h2>
|
|
<!-- XXX: Should have references to CGI definition/RFC -->
|
|
<!-- XXX: Should mention Options ExecCGI -->
|
|
|
|
<p>Any file that has the mime type
|
|
<code>application/x-httpd-cgi</code> or handler
|
|
<code>cgi-script</code> (Apache 1.1 or later) will be treated
|
|
as a CGI script, and run by the server, with its output being
|
|
returned to the client. Files acquire this type either by
|
|
having a name containing an extension defined by the <a
|
|
href="mod_mime.html#addtype">AddType</a> directive, or by being
|
|
in a <a href="mod_alias.html#scriptalias">ScriptAlias</a>
|
|
directory.</p>
|
|
|
|
<p>When the server invokes a CGI script, it will add a variable
|
|
called <code>DOCUMENT_ROOT</code> to the environment. This
|
|
variable will contain the value of the <a
|
|
href="core.html#documentroot">DocumentRoot</a> configuration
|
|
variable.</p>
|
|
|
|
<p>For an introduction to using CGI scripts with Apache, see
|
|
our tutorial on <a href="../howto/cgi.html">Dynamic Content
|
|
With CGI</a>.</p>
|
|
|
|
<p>When using a multi-threaded MPM under unix, the module <a
|
|
href="mod_cgid.html">mod_cgid</a> should be used in place of
|
|
this module. At the user level, the two modules are essentially
|
|
identical.</p>
|
|
|
|
<h2>Directives</h2>
|
|
|
|
<ul>
|
|
<li><a href="#scriptlog">ScriptLog</a></li>
|
|
|
|
<li><a href="#scriptloglength">ScriptLogLength</a></li>
|
|
|
|
<li><a href="#scriptlogbuffer">ScriptLogBuffer</a></li>
|
|
</ul>
|
|
|
|
<p>See also: <a href="core.html#options">Options</a>, <a
|
|
href="mod_alias.html#scriptalias">ScriptAlias</a>, <a
|
|
href="mod_mime.html#addtype">AddType</a> and <a
|
|
href="mod_mime.html#addhandler">AddHandler</a>.</p>
|
|
|
|
<h2>CGI Environment variables</h2>
|
|
The server will set the CGI environment variables as described
|
|
in the <a href="http://hoohoo.ncsa.uiuc.edu/cgi/">CGI
|
|
specification</a>, with the following provisions:
|
|
|
|
<dl>
|
|
<dt>REMOTE_HOST</dt>
|
|
|
|
<dd>This will only be set if <a
|
|
href="core.html#hostnamelookups"><code>HostnameLookups</code></a>
|
|
is set to <code>on</code> (it is off by default), and if a
|
|
reverse DNS lookup of the accessing host's address indeed
|
|
finds a host name.</dd>
|
|
|
|
<dt>REMOTE_IDENT</dt>
|
|
|
|
<dd>This will only be set if <a
|
|
href="core.html#identitycheck">IdentityCheck</a> is set to
|
|
<code>on</code> and the accessing host supports the ident
|
|
protocol. Note that the contents of this variable cannot be
|
|
relied upon because it can easily be faked, and if there is a
|
|
proxy between the client and the server, it is usually
|
|
totally useless.</dd>
|
|
|
|
<dt>REMOTE_USER</dt>
|
|
|
|
<dd>This will only be set if the CGI script is subject to
|
|
authentication.</dd>
|
|
</dl>
|
|
|
|
<h2><a id="cgi_debug" name="cgi_debug">CGI Debugging</a></h2>
|
|
Debugging CGI scripts has traditionally been difficult, mainly
|
|
because it has not been possible to study the output (standard
|
|
output and error) for scripts which are failing to run
|
|
properly. These directives, included in Apache 1.2 and later,
|
|
provide more detailed logging of errors when they occur.
|
|
|
|
<h2>CGI Logfile Format</h2>
|
|
When configured, the CGI error log logs any CGI which does not
|
|
execute properly. Each CGI script which fails to operate causes
|
|
several lines of information to be logged. The first two lines
|
|
are always of the format:
|
|
<pre>
|
|
%% [<em>time</em>] <em>request-line</em>
|
|
%% <em>HTTP-status</em> <em>CGI-script-filename</em>
|
|
</pre>
|
|
If the error is that CGI script cannot be run, the log file
|
|
will contain an extra two lines:
|
|
<pre>
|
|
%%error
|
|
<em>error-message</em>
|
|
</pre>
|
|
Alternatively, if the error is the result of the script
|
|
returning incorrect header information (often due to a bug in
|
|
the script), the following information is logged:
|
|
<pre>
|
|
%request
|
|
<em>All HTTP request headers received</em>
|
|
<em>POST or PUT entity (if any)</em>
|
|
%response
|
|
<em>All headers output by the CGI script</em>
|
|
%stdout
|
|
<em>CGI standard output</em>
|
|
%stderr
|
|
<em>CGI standard error</em>
|
|
</pre>
|
|
(The %stdout and %stderr parts may be missing if the script did
|
|
not output anything on standard output or standard error).
|
|
<hr />
|
|
|
|
<h3><a id="scriptlog" name="scriptlog">ScriptLog</a>
|
|
directive</h3>
|
|
<a href="directive-dict.html#Syntax"
|
|
rel="Help"><strong>Syntax:</strong></a> ScriptLog
|
|
<em>filename</em><br />
|
|
<a href="directive-dict.html#Default"
|
|
rel="Help"><strong>Default:</strong></a> none<br />
|
|
<a href="directive-dict.html#Context"
|
|
rel="Help"><strong>Context:</strong></a> server config<br />
|
|
<a href="directive-dict.html#Status"
|
|
rel="Help"><strong>Status:</strong></a> mod_cgi
|
|
|
|
<p>The <tt>ScriptLog</tt> directive sets the CGI script error
|
|
logfile. If no ScriptLog is given, no error log is created. If
|
|
given, any CGI errors are logged into the filename given as
|
|
argument. If this is a relative file or path it is taken
|
|
relative to the server root.</p>
|
|
|
|
<p>This log will be opened as the user the child processes run
|
|
as, ie. the user specified in the main <a
|
|
href="core.html#User">User</a> directive. This means that
|
|
either the directory the script log is in needs to be writable
|
|
by that user or the file needs to be manually created and set
|
|
to be writable by that user. If you place the script log in
|
|
your main logs directory, do <strong>NOT</strong> change the
|
|
directory permissions to make it writable by the user the child
|
|
processes run as.</p>
|
|
|
|
<p>Note that script logging is meant to be a debugging feature
|
|
when writing CGI scripts, and is not meant to be activated
|
|
continuously on running servers. It is not optimized for speed
|
|
or efficiency, and may have security problems if used in a
|
|
manner other than that for which it was designed.</p>
|
|
<hr />
|
|
|
|
<h3><a id="scriptloglength"
|
|
name="scriptloglength">ScriptLogLength</a> directive</h3>
|
|
<a href="directive-dict.html#Syntax"
|
|
rel="Help"><strong>Syntax:</strong></a> ScriptLogLength
|
|
<em>bytes</em><br />
|
|
<a href="directive-dict.html#Default"
|
|
rel="Help"><strong>Default:</strong></a> 10385760<br />
|
|
<a href="directive-dict.html#Context"
|
|
rel="Help"><strong>Context:</strong></a> server config<br />
|
|
<a href="directive-dict.html#Status"
|
|
rel="Help"><strong>Status:</strong></a> mod_cgi
|
|
|
|
<p><tt>ScriptLogLength</tt> can be used to limit the size of
|
|
the CGI script logfile. Since the logfile logs a lot of
|
|
information per CGI error (all request headers, all script
|
|
output) it can grow to be a big file. To prevent problems due
|
|
to unbounded growth, this directive can be used to set an
|
|
maximum file-size for the CGI logfile. If the file exceeds this
|
|
size, no more information will be written to it.</p>
|
|
<hr />
|
|
|
|
<h3><a id="scriptlogbuffer"
|
|
name="scriptlogbuffer">ScriptLogBuffer</a></h3>
|
|
<a href="directive-dict.html#Syntax"
|
|
rel="Help"><strong>Syntax:</strong></a> ScriptLogBuffer
|
|
<em>bytes</em><br />
|
|
<a href="directive-dict.html#Default"
|
|
rel="Help"><strong>Default:</strong></a> 1024<br />
|
|
<a href="directive-dict.html#Context"
|
|
rel="Help"><strong>Context:</strong></a> server config<br />
|
|
<a href="directive-dict.html#Status"
|
|
rel="Help"><strong>Status:</strong></a> mod_cgi
|
|
|
|
<p>The size of any PUT or POST entity body that is logged to
|
|
the file is limited, to prevent the log file growing too big
|
|
too quickly if large bodies are being received. By default, up
|
|
to 1024 bytes are logged, but this can be changed with this
|
|
directive. <!--#include virtual="footer.html" -->
|
|
</p>
|
|
</body>
|
|
</html>
|
|
|