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Rename

<!DOCTYPE html SYSTEM "about:legacy-compat">
<html lang="en"><head><META http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta content="width=device-width, initial-scale=1" name="viewport">

<title>mod_logio - Apache HTTP Server Version 2.4</title>
<link href="../../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet">
<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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<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"><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>
</ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="../../images/up.gif"></a></div>
<div class="section">
<h2 id="formats">Custom Log Formats <a title="Permanent link" href="#formats" class="permalink">&para;</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. May be zero in rare cases
        such as when a request is aborted before a response is sent.</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 id="logiotrackttfb"><span id="LogIOTrackTTFB">LogIOTrackTTFB</span> Directive <a title="Permanent link" href="#logiotrackttfb" class="permalink">&para;</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>
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<p class="apache">Copyright 2026 The Apache Software Foundation.<br>Licensed under the <a href="https://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
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