add some descriptions to the placeholders
for only a few hosts, you probably have access control
directives mentioning them by name. See <a
href="mod_authz_host.html#reqhost">the Require host
- documentation</a>.</td></tr>
+ documentation</a>. This format is affected by modifications to the
+ remote hostname by modules like <module>mod_remoteip</module>.</td></tr>
<tr><td><code>%{c}h</code></td>
- <td></td></tr>
+ <td>Like <code>%h</code>, but always reports on the hostname of the
+ underlying TCP connection and not any modifications to the
+ remote hostname by modules like <module>mod_remoteip</module>.</td></tr>
<tr><td><code>%H</code></td>
<td>The request protocol.</td></tr>
matching error log line to see what request caused what error.</td></tr>
<tr><td><code>%{c}L</code></td>
- <td></td></tr>
+ <td>The connection log ID from the error log (or '-' if nothing has been
+ logged to the error log for this request). Look for the
+ matching error log line to see what request caused what error.</td></tr>
<tr><td><code>%m</code></td>
<td>The request method.</td></tr>
