Merge r1307394 from trunk:

PR37194: give a hint about capturing something more like "initial" header
values when a %{foo}i might have been set or changed by a module.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1307398 13f79535-47bb-0310-9956-ffa450edef68

diff --git a/docs/manual/mod/mod_log_config.xml b/docs/manual/mod/mod_log_config.xml
index e1802617bccb6da03a45cbe9f8cd4af85ef01825..9596607c7f779413b921858dc42c561ac4fb76d1 100644 (file)
--- a/docs/manual/mod/mod_log_config.xml
+++ b/docs/manual/mod/mod_log_config.xml
@@ -106,7 +106,12 @@
     <tr><td><code>%{<var>Foobar</var>}i</code></td>
         <td>The contents of <code><var>Foobar</var>:</code> header line(s)
         in the request sent to the server. Changes made by other
-        modules (e.g. <module>mod_headers</module>) affect this.
+        modules (e.g. <module>mod_headers</module>) affect this.  If you're
+        interested in what the request header was prior to when most
+        modules would have modified it, use <module>mod_setenvif</module>
+        to copy the header into an internal environment variable and log
+        that value with the <code>%{<var>VARNAME</var>}e</code> described
+        above.
         </td></tr>
 
     <tr><td><code>%k</code></td>