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+<title>Compress Directives - Configure - H2O - the optimized HTTP/2 server</title>
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+<td class="selected">Configure</td>
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+<h2>
+<a href="configure.html">Configure</a> &gt;
+Compress Directives
+</h2>
+
+
+<p>
+The compress handler performs on-the-fly compression - it compresses the contents of an HTTP response as it is being sent, if the client indicates itself to be capable of decompressing the response transparently with the use of <a href="https://tools.ietf.org/html/rfc7231#section-5.3.4"><code>Accept-Encoding</code></a> header</li>, and if the response is deemed compressible according to the following rules.
+</p>
+<p>
+If <code>x-compress-hint</code> response header does not exist or the value is <code>auto</code>, then whether if the response is considered compressible depends on the <code>is_compressible</code> attribute assigned to the content type (see <a href="configure/file_directives.html#file.mime.addtypes"><code>file.mime.addtypes</code></a>).
+If <code>x-compress-hint</code> response header exists and the value is <code>on</code>, the response is always considered to be compressible.
+If the value of the response header is set to <code>off</code>, then the response never gets compressed.
+</p>
+
+<p>
+The following are the configuration directives recognized by the handler.
+</p>
+
+<div id="compress" class="directive-head">
+<div class="directive-since">since v2.0</div>
+<h3><a href="configure/compress_directives.html#compress"><code>"compress"</code></a></h3>
+</div>
+
+<dl class="directive-desc">
+<dt>Description:</dt>
+<dd>
+<p>
+Enables on-the-fly compression of HTTP response.
+
+</p>
+
+<p>
+If the argument is <code>ON</code>, both <a href="https://datatracker.ietf.org/doc/draft-alakuijala-brotli/">brotli</a> and <a href="https://tools.ietf.org/html/rfc1952">gzip</a> compression are enabled.
+If the argument is <code>OFF</code>, on-the-fly compression is disabled.
+If the argument is a sequence, the elements are the list of compression algorithms to be enabled.
+If the argument is a mapping, each key specifies the compression algorithm to be enabled, and the values specify the quality of the algorithms.
+</p>
+<p>
+When both brotli and gzip are enabled and if the client supports both, H2O is hard-coded to prefer brotli.
+</p>
+<div class="example">
+<div class="caption">Example. Enabling on-the-fly compression</div>
+<pre><code># enable all algorithms
+compress: ON
+
+# enable by name
+compress: [ gzip, br ]
+
+# enable gzip only
+compress: [ gzip ]
+</code></pre>
+</div>
+
+
+</dd>
+<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
+<dd>global, host, path, extension</dd>
+<dt>Default:</dt>
+<dd><code><pre>compress: OFF</pre></code>
+<dt>See also:</dt>
+<dd><a href="configure/file_directives.html#file.send-compressed"><code>file.send-compressed</code></a>, <a href="configure/file_directives.html#file.mime.addtypes"><code>file.mime.addtypes</code></a>
+</dd>
+</dl>
+
+<div id="compress-minimum-size" class="directive-head">
+<div class="directive-since">since v2.0</div>
+<h3><a href="configure/compress_directives.html#compress-minimum-size"><code>"compress-minimum-size"</code></a></h3>
+</div>
+
+<dl class="directive-desc">
+<dt>Description:</dt>
+<dd>
+<p>
+Defines the minimum size a files needs to have in order for H2O to compress the request.
+
+</p>
+
+</dd>
+<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
+<dd>global, host, path, extension</dd>
+<dt>Default:</dt>
+<dd><code><pre>compress-minimum-size: 100</pre></code>
+</dl>
+
+
+<div id="gzip" class="directive-head">
+<div class="directive-since">since v1.5</div>
+<h3><a href="configure/compress_directives.html#gzip"><code>"gzip"</code></a></h3>
+</div>
+
+<dl class="directive-desc">
+<dt>Description:</dt>
+<dd>
+<p>
+Enables on-the-fly compression of HTTP response using gzip.
+
+</p>
+
+Equivalent to <code>compress: [ gzip ]</code>.
+
+</dd>
+<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
+<dd>global, host, path, extension</dd>
+<dt>Default:</dt>
+<dd><code><pre>gzip: OFF</pre></code>
+<dt>See also:</dt>
+<dd><a href="configure/compress_directives.html#compress"><code>compress</code></a>
+</dd>
+</dl>
+
+
+
+
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+Copyright &copy; 2015 <a href="http://dena.com/intl/">DeNA Co., Ltd.</a> et al.
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