%L works without mod_unique_id, too

    information written to <code>stderr</code> by a CGI script will

    be copied directly to the error log.</p>

    <p>If <module>mod_unique_id</module> is loaded, you

    can put a <code>%L</code> token in both the error log and the access

    log, producing a log entry ID with which you can correlate the entry

    in the error log with the entry in the access log.</p>

    <p>Putting a <code>%L</code> token in both the error log and the access

    log will produce a log entry ID with which you can correlate the entry

    in the error log with the entry in the access log. If

    <module>mod_unique_id</module> is loaded, its unique request ID will be

    used as the log entry ID, too.</p>

    <p>During testing, it is often useful to continuously monitor

    the error log for any problems. On Unix systems, you can