Cache-Control: no-cache, no-cache, no-store
</code></p></div>
</li>
+ <li>
+ Set a test cookie if and only if the client didn't send us a cookie
+ <div class="example"><p><code>
+ Header set Set-Cookie testcookie !$req{Cookie}
+ </code></p></div>
+ </li>
</ol>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
which is a <a class="glossarylink" href="../glossary.html#regex" title="see glossary">regular expression</a>,
and an additional <var>replacement</var> string.</p>
- <p>The <code class="directive">Header</code> directive may be followed by an
- an additional argument, which may be used to specify conditions under
- which the action will be taken, or may be the keyword <code>early</code>
- to specify <a href="#early">early processing</a>. If the
- <a href="../env.html">environment variable</a> specified in the
- <code>env=<var>...</var></code> argument exists (or if the environment
- variable does not exist and <code>env=!<var>...</var></code> is specified)
- then the action specified by the <code class="directive">Header</code> directive
- will take effect. Otherwise, the directive will have no effect
- on the request.</p>
+ <p>The <code class="directive">Header</code> directive may be followed by
+ an additional argument, which may be any of:</p>
+ <dl>
+ <dt><code>early</code></dt>
+ <dd>Specifies <a href="#early">early processing</a>.</dd>
+ <dt><code>env=[!]varname</code></dt>
+ <dd>The directive is applied if and only if the <a href="../env.html">environment variable</a> <code>varname</code> exists.
+ A <code>!</code> in front of <code>varname</code> reverses the test,
+ so the directive applies only if <code>varname</code> is unset.</dd>
+ <dt><code>expr</code></dt>
+ <dd>An string that matches neither of the above is parsed as an
+ expression. Details of expression syntax and evaluation are
+ currently best documented on the <code class="module"><a href="../mod/mod_filter.html">mod_filter</a></code> page.</dd>
+ </dl>
<p>Except in <a href="#early">early</a> mode, the
<code class="directive">Header</code> directives are processed just
replacement string respectively.</p>
<p>The <code class="directive">RequestHeader</code> directive may be followed by
- an additional argument, which may be used to specify conditions under
- which the action will be taken, or may be the keyword <code>early</code>
- to specify <a href="#early">early processing</a>. If the
- <a href="../env.html">environment
- variable</a> specified in the <code>env=<var>...</var></code> argument
- exists (or if the environment variable does not exist and
- <code>env=!<var>...</var></code> is specified) then the action specified
- by the <code class="directive">RequestHeader</code> directive will take effect.
- Otherwise, the directive will have no effect on the request.</p>
+ an additional argument, which may be any of:</p>
+ <dl>
+ <dt><code>early</code></dt>
+ <dd>Specifies <a href="#early">early processing</a>.</dd>
+ <dt><code>env=[!]varname</code></dt>
+ <dd>The directive is applied if and only if the <a href="../env.html">environment variable</a> <code>varname</code> exists.
+ A <code>!</code> in front of <code>varname</code> reverses the test,
+ so the directive applies only if <code>varname</code> is unset.</dd>
+ <dt><code>expr</code></dt>
+ <dd>An string that matches neither of the above is parsed as an
+ expression. Details of expression syntax and evaluation are
+ currently best documented on the <code class="module"><a href="../mod/mod_filter.html">mod_filter</a></code> page.</dd>
+ </dl>
<p>Except in <a href="#early">early</a> mode, the
<code class="directive">RequestHeader</code> directive is processed
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