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+<p class="apache">Apache HTTP Server Version 2.4</p>
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+<a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="../">Version 2.4</a> &gt; <a href="./">Modules</a></div>
+<div id="page-content">
+<div id="preamble"><h1>Apache Module mod_logio</h1>
+<div class="toplang">
+<p><span>Available Languages: </span><a href="../en/mod/mod_logio.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../fr/mod/mod_logio.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a> |
+<a href="../ja/mod/mod_logio.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a> |
+<a href="../ko/mod/mod_logio.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a> |
+<a href="../tr/mod/mod_logio.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 input and output bytes per request</td></tr>
+<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
+<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>logio_module</td></tr>
+<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_logio.c</td></tr></table>
+<h3>Summary</h3>
+
+
+ <p>This module provides the logging of input and output number of
+ bytes received/sent per request. The numbers reflect the actual bytes
+ as received on the network, which then takes into account the
+ headers and bodies of requests and responses. The counting is done
+ before SSL/TLS on input and after SSL/TLS on output, so the numbers
+ will correctly reflect any changes made by encryption.</p>
+
+ <p>This module requires <code class="module"><a href="../mod/mod_log_config.html">mod_log_config</a></code>.</p>
+
+ <div class="note">When KeepAlive connections are used with SSL, the overhead of the SSL
+ handshake is reflected in the byte count of the first request on the
+ connection. When per-directory SSL renegotiation occurs, the bytes are associated
+ with the request that triggered the renegotiation.</div>
+
+</div>
+<div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3>Topics</h3>
+<ul id="topics">
+<li><img alt="" src="../images/down.gif" /> <a href="#formats">Custom Log Formats</a></li>
+</ul><h3 class="directives">Directives</h3>
+<ul id="toc">
+<li><img alt="" src="../images/down.gif" /> <a href="#logiotrackttfb">LogIOTrackTTFB</a></li>
+</ul>
+<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__&amp;list_id=144532&amp;product=Apache%20httpd-2&amp;query_format=specific&amp;order=changeddate%20DESC%2Cpriority%2Cbug_severity&amp;component=mod_logio">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&amp;component=mod_logio">Report a bug</a></li></ul><h3>See also</h3>
+<ul class="seealso">
+<li><code class="module"><a href="../mod/mod_log_config.html">mod_log_config</a></code></li>
+<li><a href="../logs.html">Apache Log Files</a></li>
+<li><a href="#comments_section">Comments</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>This module adds three new logging directives. 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>%I</code></td>
+ <td>Bytes received, including request and headers, cannot be
+ zero.</td></tr>
+<tr class="odd"><td><code>%O</code></td>
+ <td>Bytes sent, including headers, cannot be zero.</td></tr>
+<tr><td><code>%S</code></td>
+ <td>Bytes transferred (received and sent), including request and headers,
+ cannot be zero. This is the combination of %I and %O.<br />
+ Available in Apache 2.4.7 and later</td></tr>
+<tr class="odd"><td><code>%^FB</code></td>
+ <td>Delay in microseconds between when the request arrived and the
+ first byte of the response headers are written. Only available if
+ <code class="directive">LogIOTrackTTFB</code> is set to ON.<br />
+ Available in Apache 2.4.13 and later</td></tr>
+</table>
+
+ <p>Usually, the functionality is used like this:</p>
+
+ <dl>
+ <dt>Combined I/O log format:</dt>
+ <dd><code>"%h %l %u %t \"%r\" %&gt;s %b \"%{Referer}i\"
+ \"%{User-agent}i\" %I %O"</code></dd>
+ </dl>
+</div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="LogIOTrackTTFB" id="LogIOTrackTTFB">LogIOTrackTTFB</a> <a name="logiotrackttfb" id="logiotrackttfb">Directive</a></h2>
+<table class="directive">
+<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable tracking of time to first byte (TTFB)</td></tr>
+<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LogIOTrackTTFB ON|OFF</code></td></tr>
+<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>LogIOTrackTTFB OFF</code></td></tr>
+<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
+<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
+<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
+<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_logio</td></tr>
+<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Apache HTTP Server 2.4.13 and later</td></tr>
+</table>
+ <p>This directive configures whether this module tracks the delay
+ between the request being read and the first byte of the response
+ headers being written. The resulting value may be logged with the
+ <code>%^FB</code> format.</p>
+
+</div>
+</div>
+<div class="bottomlang">
+<p><span>Available Languages: </span><a href="../en/mod/mod_logio.html" title="English">&nbsp;en&nbsp;</a> |
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+<a href="../ko/mod/mod_logio.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a> |
+<a href="../tr/mod/mod_logio.html" hreflang="tr" rel="alternate" title="Türkçe">&nbsp;tr&nbsp;</a></p>
+</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&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 <a href="https://httpd.apache.org/lists.html">mailing lists</a>.</div>
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