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-<div id="page-content">
-<div id="preamble"><h1>Apache Module mod_log_config</h1>
-<div class="toplang">
-<p><span>Available Languages: </span><a href="../en/mod/mod_log_config.html" title="English">&nbsp;en&nbsp;</a> |
-<a href="../ja/mod/mod_log_config.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a> |
-<a href="../ko/mod/mod_log_config.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a> |
-<a href="../tr/mod/mod_log_config.html" hreflang="tr" rel="alternate" title="Türkçe">&nbsp;tr&nbsp;</a></p>
-</div>
-<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Logging of the requests made to the server</td></tr>
-<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Base</td></tr>
-<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>log_config_module</td></tr>
-<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_log_config.c</td></tr></table>
-<h3>Summary</h3>
-
- <p>This module provides for flexible logging of client
- requests. Logs are written in a customizable format, and may be
- written directly to a file, or to an external program.
- Conditional logging is provided so that individual requests may
- be included or excluded from the logs based on characteristics
- of the request.</p>
-
- <p>Three directives are provided by this module:
- <code class="directive"><a href="#transferlog">TransferLog</a></code> to create
- a log file, <code class="directive"><a href="#logformat">LogFormat</a></code>
- to set a custom format, and <code class="directive"><a href="#customlog">CustomLog</a></code> to define a log file and format in one
- step. The <code class="directive">TransferLog</code> and <code class="directive">CustomLog</code> directives can be used multiple times in each
- server to cause each request to be logged to multiple files.</p>
-</div>
-<div id="quickview"><h3 class="directives">Directives</h3>
-<ul id="toc">
-<li><img alt="" src="../images/down.gif" /> <a href="#bufferedlogs">BufferedLogs</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#cookielog">CookieLog</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#customlog">CustomLog</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#logformat">LogFormat</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#transferlog">TransferLog</a></li>
-</ul>
-<h3>Topics</h3>
-<ul id="topics">
-<li><img alt="" src="../images/down.gif" /> <a href="#formats">Custom Log Formats</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#security">Security Considerations</a></li>
-</ul><h3>See also</h3>
-<ul class="seealso">
-<li><a href="../logs.html">Apache Log Files</a></li>
-</ul></div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="section">
-<h2><a name="formats" id="formats">Custom Log Formats</a></h2>
-
- <p>The format argument to the <code class="directive"><a href="#logformat">LogFormat</a></code> and <code class="directive"><a href="#customlog">CustomLog</a></code> directives is a string. This string is
- used to log each request to the log file. It can contain literal
- characters copied into the log files and the C-style control
- characters "\n" and "\t" to represent new-lines and tabs.
- Literal quotes and backslashes should be escaped with
- backslashes.</p>
-
- <p>The characteristics of the request itself are logged by
- placing "<code>%</code>" directives in the format string, which are
- replaced in the log file by the values as follows:</p>
-
- <table class="bordered"><tr class="header"><th>Format&nbsp;String</th>
- <th>Description</th></tr>
-<tr><td><code>%%</code></td>
- <td>The percent sign (<em>Apache 2.0.44 and later</em>)</td></tr>
-<tr class="odd"><td><code>%...a</code></td>
- <td>Remote IP-address</td></tr>
-<tr><td><code>%...A</code></td>
- <td>Local IP-address</td></tr>
-<tr class="odd"><td><code>%...B</code></td>
- <td>Size of response in bytes, excluding HTTP headers.</td></tr>
-<tr><td><code>%...b</code></td>
- <td>Size of response in bytes, excluding HTTP headers. In CLF format, <em>i.e.</em>
- a '<code>-</code>' rather than a 0 when no bytes are sent.</td></tr>
-<tr class="odd"><td><code>%...{<var>Foobar</var>}C</code></td>
- <td>The contents of cookie <var>Foobar</var> in the request sent
- to the server.</td></tr>
-<tr><td><code>%...D</code></td>
- <td>The time taken to serve the request, in microseconds.</td></tr>
-<tr class="odd"><td><code>%...{<var>FOOBAR</var>}e</code></td>
- <td>The contents of the environment variable
- <var>FOOBAR</var></td></tr>
-<tr><td><code>%...f</code></td>
- <td>Filename</td></tr>
-<tr class="odd"><td><code>%...h</code></td>
- <td>Remote host</td></tr>
-<tr><td><code>%...H</code></td>
- <td>The request protocol</td></tr>
-<tr class="odd"><td><code>%...{<var>Foobar</var>}i</code></td>
- <td>The contents of <code><var>Foobar</var>:</code> header line(s)
- in the request sent to the server. Changes made by other
- modules (e.g. <code class="module"><a href="../mod/mod_headers.html">mod_headers</a></code>) affect this.
- </td></tr>
-<tr><td><code>%...l</code></td>
- <td>Remote logname (from identd, if supplied). This will return a
- dash unless <code class="directive"><a href="../mod/core.html#identitycheck">IdentityCheck</a></code> is set
- <code>On</code>.</td></tr>
-<tr class="odd"><td><code>%...m</code></td>
- <td>The request method</td></tr>
-<tr><td><code>%...{<var>Foobar</var>}n</code></td>
- <td>The contents of note <var>Foobar</var> from another
- module.</td></tr>
-<tr class="odd"><td><code>%...{<var>Foobar</var>}o</code></td>
- <td>The contents of <code><var>Foobar</var>:</code> header line(s)
- in the reply.</td></tr>
-<tr><td><code>%...p</code></td>
- <td>The canonical port of the server serving the request</td></tr>
-<tr class="odd"><td><code>%...P</code></td>
- <td>The process ID of the child that serviced the request.</td></tr>
-<tr><td><code>%...{<var>format</var>}P</code></td>
- <td>The process ID or thread id of the child that serviced the
- request. Valid formats are <code>pid</code> and <code>tid</code>.
- (<em>Apache 2.0.46 and later</em>)
- </td></tr>
-<tr class="odd"><td><code>%...q</code></td>
- <td>The query string (prepended with a <code>?</code> if a query
- string exists, otherwise an empty string)</td></tr>
-<tr><td><code>%...r</code></td>
- <td>First line of request</td></tr>
-<tr class="odd"><td><code>%...s</code></td>
- <td>Status. For requests that got internally redirected, this is
- the status of the *original* request --- <code>%...&gt;s</code>
- for the last.</td></tr>
-<tr><td><code>%...t</code></td>
- <td>Time the request was received (standard english
- format)</td></tr>
-<tr class="odd"><td><code>%...{<var>format</var>}t</code></td>
- <td>The time, in the form given by format, which should be in
- <code>strftime(3)</code> format. (potentially localized)</td></tr>
-<tr><td><code>%...T</code></td>
- <td>The time taken to serve the request, in seconds.</td></tr>
-<tr class="odd"><td><code>%...u</code></td>
- <td>Remote user (from auth; may be bogus if return status
- (<code>%s</code>) is 401)</td></tr>
-<tr><td><code>%...U</code></td>
- <td>The URL path requested, not including any query string.</td></tr>
-<tr class="odd"><td><code>%...v</code></td>
- <td>The canonical <code class="directive"><a href="../mod/core.html#servername">ServerName</a></code>
- of the server serving the request.</td></tr>
-<tr><td><code>%...V</code></td>
- <td>The server name according to the <code class="directive"><a href="../mod/core.html#usecanonicalname">UseCanonicalName</a></code> setting.</td></tr>
-<tr class="odd"><td><code>%...X</code></td>
- <td>Connection status when response is completed:
-
- <table>
-
- <tr><td><code>X</code> =</td>
- <td>connection aborted before the response completed.</td></tr>
- <tr><td><code>+</code> =</td>
- <td>connection may be kept alive after the response is
- sent.</td></tr>
- <tr><td><code>-</code> = </td>
- <td>connection will be closed after the response is
- sent.</td></tr>
- </table>
-
- <p>(This directive was <code>%...c</code> in late versions of Apache
- 1.3, but this conflicted with the historical ssl
- <code>%...{<var>var</var>}c</code> syntax.)</p></td></tr>
-<tr><td><code>%...I</code></td>
- <td>Bytes received, including request and headers, cannot be zero.
- You need to enable <code class="module"><a href="../mod/mod_logio.html">mod_logio</a></code> to use this.</td></tr>
-<tr class="odd"><td><code>%...O</code></td>
- <td>Bytes sent, including headers, cannot be zero. You need to
- enable <code class="module"><a href="../mod/mod_logio.html">mod_logio</a></code> to use this.</td></tr>
-</table>
-
- <p>The "<var>...</var>" can be nothing at all (<em>e.g.</em>,
- <code>"%h %u %r %s %b"</code>), or it can indicate conditions for
- inclusion of the item (which will cause it to be replaced with "-" if
- the condition is not met). The forms of condition are a list of
- HTTP status codes, which may or may not be preceded by "!".
- Thus, "%400,501{User-agent}i" logs <code>User-agent:</code> on 400
- errors and 501 errors (Bad Request, Not Implemented) only;
- "%!200,304,302{Referer}i" logs <code>Referer:</code> on all requests
- which did <em>not</em> return some sort of normal status.</p>
-
- <p>The modifiers "&lt;" and "&gt;" can be used for requests that
- have been internally redirected to choose whether the original or
- final (respectively) request should be consulted. By default, the
- <code>%</code> directives <code>%s, %U, %T, %D,</code> and
- <code>%r</code> look at the original request while all others look
- at the final request. So for example, <code>%&gt;s</code> can be
- used to record the final status of the request and
- <code>%&lt;u</code> can be used to record the original
- authenticated user on a request that is internally redirected to an
- unauthenticated resource.</p>
-
- <p>Note that in httpd 2.0 versions prior to 2.0.46, no escaping was performed
- on the strings from <code>%...r</code>, <code>%...i</code> and
- <code>%...o</code>. This was mainly to comply with the requirements of
- the Common Log Format. This implied that clients could insert control
- characters into the log, so you had to be quite careful when dealing
- with raw log files.</p>
-
- <p>For security reasons, starting with 2.0.46, non-printable and
- other special characters are escaped mostly by using
- <code>\x<var>hh</var></code> sequences, where <var>hh</var> stands for
- the hexadecimal representation of the raw byte. Exceptions from this
- rule are <code>"</code> and <code>\</code> which are escaped by prepending
- a backslash, and all whitespace characters which are written in their
- C-style notation (<code>\n</code>, <code>\t</code> etc).</p>
-
- <p>Note that in httpd 2.0, unlike 1.3, the <code>%b</code> and
- <code>%B</code> format strings do not represent the number of
- bytes sent to the client, but simply the size in bytes of the HTTP
- response (which will differ, for instance, if the connection is
- aborted, or if SSL is used). The <code>%O</code> format provided
- by <code class="module"><a href="../mod/mod_logio.html">mod_logio</a></code> will log the actual number of bytes
- sent over the network.</p>
-
- <p>Some commonly used log format strings are:</p>
-
- <dl>
- <dt>Common Log Format (CLF)</dt>
- <dd><code>"%h %l %u %t \"%r\" %&gt;s %b"</code></dd>
-
- <dt>Common Log Format with Virtual Host</dt>
- <dd><code>"%v %h %l %u %t \"%r\" %&gt;s %b"</code></dd>
-
- <dt>NCSA extended/combined log format</dt>
- <dd><code>"%h %l %u %t \"%r\" %&gt;s %b \"%{Referer}i\"
- \"%{User-agent}i\""</code></dd>
-
- <dt>Referer log format</dt>
- <dd><code>"%{Referer}i -&gt; %U"</code></dd>
-
- <dt>Agent (Browser) log format</dt>
- <dd><code>"%{User-agent}i"</code></dd>
- </dl>
-
- <p>Note that the canonical <code class="directive"><a href="../mod/core.html#servername">ServerName</a></code> and <code class="directive"><a href="../mod/mpm_common.html#listen">Listen</a></code> of the server serving the
- request are used for <code>%v</code> and <code>%p</code>
- respectively. This happens regardless of the <code class="directive"><a href="../mod/core.html#usecanonicalname">UseCanonicalName</a></code> setting
- because otherwise log analysis programs would have to duplicate
- the entire vhost matching algorithm in order to decide what
- host really served the request.</p>
-</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="section">
-<h2><a name="security" id="security">Security Considerations</a></h2>
- <p>See the <a href="../misc/security_tips.html#serverroot">security tips</a>
- document for details on why your security could be compromised
- if the directory where logfiles are stored is writable by
- anyone other than the user that starts the server.</p>
-</div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="BufferedLogs" id="BufferedLogs">BufferedLogs</a> <a name="bufferedlogs" id="bufferedlogs">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Buffer log entries in memory before writing to disk</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>BufferedLogs On|Off</code></td></tr>
-<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>BufferedLogs Off</code></td></tr>
-<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
-<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
-<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_log_config</td></tr>
-<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in versions 2.0.41 and later.</td></tr>
-</table>
- <p>The <code class="directive">BufferedLogs</code> directive causes
- <code class="module"><a href="../mod/mod_log_config.html">mod_log_config</a></code> to store several log entries in
- memory and write them together to disk, rather than writing them
- after each request. On some systems, this may result in more
- efficient disk access and hence higher performance. It may be
- set only once for the entire server; it cannot be configured
- per virtual-host.</p>
-
- <div class="note">This directive is experimental and should be used with
- caution.</div>
-
-</div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="CookieLog" id="CookieLog">CookieLog</a> <a name="cookielog" id="cookielog">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets filename for the logging of cookies</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CookieLog <var>filename</var></code></td></tr>
-<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
-<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
-<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_log_config</td></tr>
-<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>This directive is deprecated.</td></tr>
-</table>
- <p>The <code class="directive">CookieLog</code> directive sets the
- filename for logging of cookies. The filename is relative to the
- <code class="directive"><a href="../mod/core.html#serverroot">ServerRoot</a></code>. This directive is
- included only for compatibility with <code>mod_cookies</code>,
- and is deprecated.</p>
-
-</div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="CustomLog" id="CustomLog">CustomLog</a> <a name="customlog" id="customlog">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets filename and format of log file</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CustomLog <var>file</var>|<var>pipe</var>
-<var>format</var>|<var>nickname</var>
-[env=[!]<var>environment-variable</var>]</code></td></tr>
-<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
-<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
-<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_log_config</td></tr>
-</table>
- <p>The <code class="directive">CustomLog</code> directive is used to
- log requests to the server. A log format is specified, and the
- logging can optionally be made conditional on request
- characteristics using environment variables.</p>
-
- <p>The first argument, which specifies the location to which
- the logs will be written, can take one of the following two
- types of values:</p>
-
- <dl>
- <dt><var>file</var></dt>
- <dd>A filename, relative to the <code class="directive"><a href="../mod/core.html#serverroot">ServerRoot</a></code>.</dd>
-
- <dt><var>pipe</var></dt>
- <dd>The pipe character "<code>|</code>", followed by the path
- to a program to receive the log information on its standard
- input.
-
- <div class="warning"><h3>Security:</h3>
- <p>If a program is used, then it will be run as the user who
- started <code class="program"><a href="../programs/httpd.html">httpd</a></code>. This will be root if the server was
- started by root; be sure that the program is secure.</p>
- </div>
- <div class="warning"><h3>Note</h3>
- <p>When entering a file path on non-Unix platforms, care should be taken
- to make sure that only forward slashed are used even though the platform
- may allow the use of back slashes. In general it is a good idea to always
- use forward slashes throughout the configuration files.</p>
- </div></dd>
- </dl>
-
- <p>The second argument specifies what will be written to the
- log file. It can specify either a <var>nickname</var> defined by
- a previous <code class="directive"><a href="#logformat">LogFormat</a></code>
- directive, or it can be an explicit <var>format</var> string as
- described in the <a href="#formats">log formats</a> section.</p>
-
- <p>For example, the following two sets of directives have
- exactly the same effect:</p>
-
- <div class="example"><p><code>
- # CustomLog with format nickname<br />
- LogFormat "%h %l %u %t \"%r\" %&gt;s %b" common<br />
- CustomLog logs/access_log common<br />
- <br />
- # CustomLog with explicit format string<br />
- CustomLog logs/access_log "%h %l %u %t \"%r\" %&gt;s %b"
- </code></p></div>
-
- <p>The third argument is optional and controls whether or
- not to log a particular request based on the
- presence or absence of a particular variable in the server
- environment. If the specified <a href="../env.html">environment
- variable</a> is set for the request (or is not set, in the case
- of a '<code>env=!<var>name</var></code>' clause), then the
- request will be logged.</p>
-
- <p>Environment variables can be set on a per-request
- basis using the <code class="module"><a href="../mod/mod_setenvif.html">mod_setenvif</a></code>
- and/or <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> modules. For
- example, if you want to record requests for all GIF
- images on your server in a separate logfile but not in your main
- log, you can use:</p>
-
- <div class="example"><p><code>
- SetEnvIf Request_URI \.gif$ gif-image<br />
- CustomLog gif-requests.log common env=gif-image<br />
- CustomLog nongif-requests.log common env=!gif-image
- </code></p></div>
-
- <p>Or, to reproduce the behavior of the old RefererIgnore
- directive, you might use the following:</p>
-
- <div class="example"><p><code>
- SetEnvIf Referer example\.com localreferer<br />
- CustomLog referer.log referer env=!localreferer
- </code></p></div>
-
-</div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="LogFormat" id="LogFormat">LogFormat</a> <a name="logformat" id="logformat">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Describes a format for use in a log file</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LogFormat <var>format</var>|<var>nickname</var>
-[<var>nickname</var>]</code></td></tr>
-<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>LogFormat "%h %l %u %t \"%r\" %&gt;s %b"</code></td></tr>
-<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
-<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
-<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_log_config</td></tr>
-</table>
- <p>This directive specifies the format of the access log
- file.</p>
-
- <p>The <code class="directive">LogFormat</code> directive can take one of two
- forms. In the first form, where only one argument is specified,
- this directive sets the log format which will be used by logs
- specified in subsequent <code class="directive">TransferLog</code>
- directives. The single argument can specify an explicit
- <var>format</var> as discussed in the <a href="#formats">custom log
- formats</a> section above. Alternatively, it can use a
- <var>nickname</var> to refer to a log format defined in a
- previous <code class="directive">LogFormat</code> directive as described
- below.</p>
-
- <p>The second form of the <code class="directive">LogFormat</code>
- directive associates an explicit <var>format</var> with a
- <var>nickname</var>. This <var>nickname</var> can then be used in
- subsequent <code class="directive">LogFormat</code> or
- <code class="directive"><a href="#customlog">CustomLog</a></code> directives
- rather than repeating the entire format string. A
- <code class="directive">LogFormat</code> directive that defines a nickname
- <strong>does nothing else</strong> -- that is, it <em>only</em>
- defines the nickname, it doesn't actually apply the format and make
- it the default. Therefore, it will not affect subsequent
- <code class="directive"><a href="#transferlog">TransferLog</a></code> directives.
- In addition, <code class="directive">LogFormat</code> cannot use one nickname
- to define another nickname. Note that the nickname should not contain
- percent signs (<code>%</code>).</p>
-
- <div class="example"><h3>Example</h3><p><code>
- LogFormat "%v %h %l %u %t \"%r\" %&gt;s %b" vhost_common
- </code></p></div>
-
-</div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="TransferLog" id="TransferLog">TransferLog</a> <a name="transferlog" id="transferlog">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Specify location of a log file</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>TransferLog <var>file</var>|<var>pipe</var></code></td></tr>
-<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
-<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
-<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_log_config</td></tr>
-</table>
- <p>This directive has exactly the same arguments and effect as
- the <code class="directive"><a href="#customlog">CustomLog</a></code>
- directive, with the exception that it does not allow the log format
- to be specified explicitly or for conditional logging of requests.
- Instead, the log format is determined by the most recently specified
- <code class="directive"><a href="#logformat">LogFormat</a></code> directive
- which does not define a nickname. Common Log Format is used if no
- other format has been specified.</p>
-
- <div class="example"><h3>Example</h3><p><code>
- LogFormat "%h %l %u %t \"%r\" %&gt;s %b \"%{Referer}i\" \"%{User-agent}i\""<br />
- TransferLog logs/access_log
- </code></p></div>
-
-</div>
-</div>
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