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<div id="preamble"><h1>Apache Module mod_logio</h1>
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<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>

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<div id="quickview"><h3 class="directives">Directives</h3>
<p>This module provides no
            directives.</p>
<h3>Topics</h3>
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<li><img alt="" src="../images/down.gif" /> <a href="#formats">Custom Log Formats</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><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
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<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>
</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>
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