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<title>Headers Directives - Configure - H2O - the optimized HTTP/2 server</title>
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<td><a href="index.html">Top</a></td>
<td><a href="install.html">Install</a></td>
<td class="selected">Configure</td>
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<h2>
<a href="configure.html">Configure</a> >
Headers Directives
</h2>
<p>
This document describes the configuration directives of the headers handler.
</p>
<div id="header.add" class="directive-head">
<h3><a href="configure/headers_directives.html#header.add"><code>"header.add"</code></a></h3>
</div>
<dl class="directive-desc">
<dt>Description:</dt>
<dd>
<p>
Adds a new header line to the response headers, regardless if a header with the same name already exists.
</p>
<div class="example">
<div class="caption">Example. Setting the <code>Set-Cookie</code> header</div>
<pre><code>header.add: "Set-Cookie: test=1"</code></pre>
</div>
</dd>
<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
<dd>global, host, path, extension</dd>
</dl>
<div id="header.append" class="directive-head">
<h3><a href="configure/headers_directives.html#header.append"><code>"header.append"</code></a></h3>
</div>
<dl class="directive-desc">
<dt>Description:</dt>
<dd>
<p>
Adds a new header line, or appends the value to the existing header with the same name, separated by <code>,</code>.
</p>
</dd>
<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
<dd>global, host, path, extension</dd>
</dl>
<div id="header.merge" class="directive-head">
<h3><a href="configure/headers_directives.html#header.merge"><code>"header.merge"</code></a></h3>
</div>
<dl class="directive-desc">
<dt>Description:</dt>
<dd>
<p>
Adds a new header line, or merges the value to the existing header of comma-separated values.
</p>
<p>
The following example sets the <code>must-revalidate</code> attribute of the <code>Cache-Control</code> header when and only when the attribute is not yet being set.
</p>
<div class="example">
<div class="caption">Example. Setting the <code>must-revalidate</code> attribute</div>
<pre><code>header.merge: "Cache-Control: must-revalidate"
</code></pre>
</div>
</dd>
<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
<dd>global, host, path, extension</dd>
</dl>
<div id="header.set" class="directive-head">
<h3><a href="configure/headers_directives.html#header.set"><code>"header.set"</code></a></h3>
</div>
<dl class="directive-desc">
<dt>Description:</dt>
<dd>
<p>
Sets a header line, removing headers with the same name if exists.
</p>
<div class="example">
<div class="caption">Example. Setting the <code>X-Content-Type-Options: nosniff</code> header</div>
<pre><code>header.set: "X-Content-Type-Options: nosniff"
</code></pre>
</div>
</dd>
<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
<dd>global, host, path, extension</dd>
</dl>
<div id="header.setifempty" class="directive-head">
<h3><a href="configure/headers_directives.html#header.setifempty"><code>"header.setifempty"</code></a></h3>
</div>
<dl class="directive-desc">
<dt>Description:</dt>
<dd>
<p>
Sets a header line when and only when a header with the same name does not already exist.
</p>
</dd>
<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
<dd>global, host, path, extension</dd>
</dl>
<div id="header.unset" class="directive-head">
<h3><a href="configure/headers_directives.html#header.unset"><code>"header.unset"</code></a></h3>
</div>
<dl class="directive-desc">
<dt>Description:</dt>
<dd>
<p>
Removes headers with given name.
</p>
<div class="example">
<div class="caption">Example. Removing the <code>X-Powered-By</code> header</div>
<pre><code>header.unset: "X-Powered-By"
</code></pre>
</div>
</dd>
<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
<dd>global, host, path, extension</dd>
</dl>
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