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21 <p class="apache">Apache HTTP Server Version 2.5</p>
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26 <div id="page-content">
27 <div id="preamble"><h1>Apache Module mod_cgi</h1>
29 <p><span>Available Languages: </span><a href="../en/mod/mod_cgi.html" title="English"> en </a> |
30 <a href="../fr/mod/mod_cgi.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
31 <a href="../ja/mod/mod_cgi.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
32 <a href="../ko/mod/mod_cgi.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
34 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Execution of CGI scripts</td></tr>
35 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Base</td></tr>
36 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>cgi_module</td></tr>
37 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_cgi.c</td></tr></table>
40 <p>Any file that has the handler
41 <code>cgi-script</code> will be treated
42 as a CGI script, and run by the server, with its output being
43 returned to the client. Files acquire this handler either by
44 having a name containing an extension defined by the
45 <code class="directive"><a href="../mod/mod_mime.html#addhandler">AddHandler</a></code> directive, or by being
46 in a <code class="directive"><a href="../mod/mod_alias.html#scriptalias">ScriptAlias</a></code>
49 <p>For an introduction to using CGI scripts with Apache, see
50 our tutorial on <a href="../howto/cgi.html">Dynamic Content
53 <p>When using a multi-threaded MPM under unix, the module
54 <code class="module"><a href="../mod/mod_cgid.html">mod_cgid</a></code> should be used in place of
55 this module. At the user level, the two modules are essentially
58 <p>For backward-compatibility, the cgi-script handler will also be activated
59 for any file with the mime-type <code>application/x-httpd-cgi</code>. The
60 use of the magic mime-type is deprecated.</p>
62 <div id="quickview"><h3>Topics</h3>
64 <li><img alt="" src="../images/down.gif" /> <a href="#env">CGI Environment variables</a></li>
65 <li><img alt="" src="../images/down.gif" /> <a href="#cgi-debug">CGI Debugging</a></li>
66 </ul><h3 class="directives">Directives</h3>
68 <li><img alt="" src="../images/down.gif" /> <a href="#cgiscripttimeout">CGIScriptTimeout</a></li>
69 <li><img alt="" src="../images/down.gif" /> <a href="#scriptlog">ScriptLog</a></li>
70 <li><img alt="" src="../images/down.gif" /> <a href="#scriptlogbuffer">ScriptLogBuffer</a></li>
71 <li><img alt="" src="../images/down.gif" /> <a href="#scriptloglength">ScriptLogLength</a></li>
73 <h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_cgi">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_cgi">Report a bug</a></li></ul><h3>See also</h3>
75 <li><code class="directive"><a href="../mod/core.html#acceptpathinfo">AcceptPathInfo</a></code></li>
76 <li><code class="directive"><a href="../mod/core.html#options">Options</a></code> ExecCGI</li>
77 <li><code class="directive"><a href="../mod/mod_alias.html#scriptalias">ScriptAlias</a></code></li>
78 <li><code class="directive"><a href="../mod/mod_mime.html#addhandler">AddHandler</a></code></li>
79 <li><a href="../suexec.html">Running CGI programs under different
81 <li><a href="http://www.ietf.org/rfc/rfc3875">CGI Specification</a></li>
82 <li><a href="#comments_section">Comments</a></li></ul></div>
83 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
85 <h2><a name="env" id="env">CGI Environment variables</a> <a title="Permanent link" href="#env" class="permalink">¶</a></h2>
86 <p>The server will set the CGI environment variables as described
87 in the <a href="http://www.ietf.org/rfc/rfc3875">CGI specification</a>,
88 with the following provisions:</p>
93 <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
94 <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>
95 /more/path/info</code> following the script filename in the URI),
96 while the core server will return a 404 NOT FOUND error for requests
97 with additional path info. Omitting the <code class="directive">AcceptPathInfo</code> directive has the same effect as setting
98 it <code>On</code> for <code class="module"><a href="../mod/mod_cgi.html">mod_cgi</a></code> requests.</dd>
102 <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
103 is off by default), and if a reverse DNS lookup of the accessing
104 host's address indeed finds a host name.</dd>
106 <dt>REMOTE_IDENT</dt>
108 <dd>This will only be set if <code class="directive"><a href="../mod/mod_ident.html#identitycheck">IdentityCheck</a></code> is set to
109 <code>on</code> and the accessing host supports the ident
110 protocol. Note that the contents of this variable cannot be
111 relied upon because it can easily be faked, and if there is a
112 proxy between the client and the server, it is usually
113 totally useless.</dd>
117 <dd>This will only be set if the CGI script is subject to
121 <p>This module also leverages the core functions
122 <a href="https://ci.apache.org/projects/httpd/trunk/doxygen/group__APACHE__CORE__SCRIPT.html#ga0e81f9571a8a73f5da0e89e1f46d34b1">ap_add_common_vars</a> and
123 <a href="https://ci.apache.org/projects/httpd/trunk/doxygen/group__APACHE__CORE__SCRIPT.html#ga6b975cd7ff27a338cb8752381a4cc14f">ap_add_cgi_vars</a>
124 to add environment variables like:</p>
126 <dt>DOCUMENT_ROOT</dt>
128 <dd>Set with the content of the related <code class="directive"><a href="../mod/core.html#documentroot">DocumentRoot</a></code> directive.</dd>
132 <dd>The fully qualified domain name related to the request.</dd>
136 <dd>The IP address of the Virtual Host serving the request.</dd>
138 <dt>SERVER_ADMIN</dt>
140 <dd>Set with the content of the related <code class="directive"><a href="../mod/core.html#serveradmin">ServerAdmin</a></code> directive.</dd>
142 <p>For an exhaustive list it is suggested to write a basic CGI script
143 that dumps all the environment variables passed by Apache in a convenient format.
145 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
146 <div class="section">
147 <h2><a name="cgi-debug" id="cgi-debug">CGI Debugging</a> <a title="Permanent link" href="#cgi-debug" class="permalink">¶</a></h2>
148 <p>Debugging CGI scripts has traditionally been difficult, mainly
149 because it has not been possible to study the output (standard
150 output and error) for scripts which are failing to run
151 properly. These directives provide more detailed logging of errors
154 <h3>CGI Logfile Format</h3>
155 <p>When configured, the CGI error log logs any CGI which does not
156 execute properly. Each CGI script which fails to operate causes
157 several lines of information to be logged. The first two lines
158 are always of the format:</p>
160 <div class="example"><p><code>
161 %% [<var>time</var>] <var>request-line</var><br />
162 %% <var>HTTP-status</var> <var>CGI-script-filename</var>
165 <p>If the error is that CGI script cannot be run, the log file
166 will contain an extra two lines:</p>
168 <div class="example"><p><code>
170 <var>error-message</var>
173 <p>Alternatively, if the error is the result of the script
174 returning incorrect header information (often due to a bug in
175 the script), the following information is logged:</p>
177 <div class="example"><p><code>
179 <var>All HTTP request headers received</var><br />
180 <var>POST or PUT entity (if any)</var><br />
182 <var>All headers output by the CGI script</var><br />
184 <var>CGI standard output</var><br />
186 <var>CGI standard error</var><br />
189 <p>(The %stdout and %stderr parts may be missing if the script did
190 not output anything on standard output or standard error).</p>
193 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
194 <div class="directive-section"><h2><a name="CGIScriptTimeout" id="CGIScriptTimeout">CGIScriptTimeout</a> <a name="cgiscripttimeout" id="cgiscripttimeout">Directive</a> <a title="Permanent link" href="#cgiscripttimeout" class="permalink">¶</a></h2>
195 <table class="directive">
196 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The length of time to wait for more output from the
197 CGI program</td></tr>
198 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CGIScriptTimeout <var>time</var>[s|ms]</code></td></tr>
199 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>value of <code class="directive"><a href="../mod/core.html#timeout">Timeout</a></code> directive when
200 unset</code></td></tr>
201 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
202 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
203 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cgi</td></tr>
205 <p>This directive limits the length of time to wait for more output from
206 the CGI program. If the time is exceeded, the request and CGI are
209 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">CGIScriptTimeout 20</pre>
214 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
215 <div class="directive-section"><h2><a name="ScriptLog" id="ScriptLog">ScriptLog</a> <a name="scriptlog" id="scriptlog">Directive</a> <a title="Permanent link" href="#scriptlog" class="permalink">¶</a></h2>
216 <table class="directive">
217 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Location of the CGI script error logfile</td></tr>
218 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ScriptLog <var>file-path</var></code></td></tr>
219 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
220 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
221 <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>
223 <p>The <code class="directive">ScriptLog</code> directive sets the CGI
224 script error logfile. If no <code class="directive">ScriptLog</code> is given,
225 no error log is created. If given, any CGI errors are logged into the
226 filename given as argument. If this is a relative file or path it is
227 taken relative to the <code class="directive"><a href="../mod/core.html#serverroot">ServerRoot</a></code>.
230 <div class="example"><h3>Example</h3><pre class="prettyprint lang-config">ScriptLog logs/cgi_log</pre>
233 <p>This log will be opened as the user the child processes run
234 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
235 either the directory the script log is in needs to be writable
236 by that user or the file needs to be manually created and set
237 to be writable by that user. If you place the script log in
238 your main logs directory, do <strong>NOT</strong> change the
239 directory permissions to make it writable by the user the child
240 processes run as.</p>
242 <p>Note that script logging is meant to be a debugging feature
243 when writing CGI scripts, and is not meant to be activated
244 continuously on running servers. It is not optimized for speed
245 or efficiency, and may have security problems if used in a
246 manner other than that for which it was designed.</p>
249 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
250 <div class="directive-section"><h2><a name="ScriptLogBuffer" id="ScriptLogBuffer">ScriptLogBuffer</a> <a name="scriptlogbuffer" id="scriptlogbuffer">Directive</a> <a title="Permanent link" href="#scriptlogbuffer" class="permalink">¶</a></h2>
251 <table class="directive">
252 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum amount of PUT or POST requests that will be recorded
253 in the scriptlog</td></tr>
254 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ScriptLogBuffer <var>bytes</var></code></td></tr>
255 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ScriptLogBuffer 1024</code></td></tr>
256 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
257 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
258 <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>
260 <p>The size of any PUT or POST entity body that is logged to
261 the file is limited, to prevent the log file growing too big
262 too quickly if large bodies are being received. By default, up
263 to 1024 bytes are logged, but this can be changed with this
267 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
268 <div class="directive-section"><h2><a name="ScriptLogLength" id="ScriptLogLength">ScriptLogLength</a> <a name="scriptloglength" id="scriptloglength">Directive</a> <a title="Permanent link" href="#scriptloglength" class="permalink">¶</a></h2>
269 <table class="directive">
270 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Size limit of the CGI script logfile</td></tr>
271 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ScriptLogLength <var>bytes</var></code></td></tr>
272 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ScriptLogLength 10385760</code></td></tr>
273 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
274 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
275 <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>
277 <p><code class="directive">ScriptLogLength</code> can be used to limit the
278 size of the CGI script logfile. Since the logfile logs a lot of
279 information per CGI error (all request headers, all script output)
280 it can grow to be a big file. To prevent problems due to unbounded
281 growth, this directive can be used to set an maximum file-size for
282 the CGI logfile. If the file exceeds this size, no more
283 information will be written to it.</p>
287 <div class="bottomlang">
288 <p><span>Available Languages: </span><a href="../en/mod/mod_cgi.html" title="English"> en </a> |
289 <a href="../fr/mod/mod_cgi.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
290 <a href="../ja/mod/mod_cgi.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
291 <a href="../ko/mod/mod_cgi.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
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