Document the %s format specifier.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@102816 13f79535-47bb-0310-9956-ffa450edef68

diff --git a/docs/manual/mod/mod_headers.xml b/docs/manual/mod/mod_headers.xml
index 61616fdb140b03642fcb5b90e2d0bf4b4ac4353a..77da2a029f5d1f34700be33155a6f165725d8717 100644 (file)
--- a/docs/manual/mod/mod_headers.xml
+++ b/docs/manual/mod/mod_headers.xml
@@ -249,8 +249,24 @@ is available only in Apache 2.0</compatibility>
     <tr><td><code>%{FOOBAR}e</code></td>
         <td>The contents of the <a href="../env.html">environment
         variable</a> <code>FOOBAR</code>.</td></tr>
+
+    <tr><td><code>%{FOOBAR}s</code></td>
+        <td>The contents of the <a href="mod_ssl.html#envvars">SSL environment
+        variable</a> <code>FOOBAR</code>, if <module>mod_ssl</module> is enabled.</td></tr>
+
     </table>
 
+    <note><title>Note</title>
+
+      <p>The <code>%s</code> format specifier is only available in
+      Apache 2.1 and later; it can be used instead of <code>%e</code>
+      to avoid the overhead of enabling <code>SSLOptions
+      +StdEnvVars</code>.  If <code>SSLOptions +StdEnvVars</code> must
+      be enabled anyway for some other reason, <code>%e</code> will be
+      more efficient than <code>%s</code>.</p>
+
+    </note> 
+
     <p>When the <directive>Header</directive> directive is used with the
     <code>add</code>, <code>append</code>, or <code>set</code>
     argument, a fourth argument may be used to specify conditions