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<modulesynopsis>

<name>mod_logio</name>

<description>Logging of input and output bytes per request</description>

<status>Base</status>

<sourcefile>mod_logio.c</sourcefile>

<identifier>logio_module</identifier>

<summary>

<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 <module>mod_log_config</module>.</p>

</summary>

<seealso><a href="/logs.html">Apache Log Files</a></seealso>

<section id="formats">

<title>Custom Log Formats</title>

<p>This modules adds two new logging directives. The characteristics of the

request itself are logged by placing "%" directives in the format string,

which are replaced in the log file by the values as follows:</p>

<table>

<tr><td>%...I:</td>

<td>Bytes received, including request and headers, cannot be zero.</td></tr>

<tr><td>%...O:</td>

<td>Bytes sent, including headers, cannot be zero.</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>

</section>

</modulesynopsis>