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-<title>Proxy Directives - Configure - H2O - the optimized HTTP/2 server</title>
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-<div id="top">
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-<a href="index.html">H2O</a>
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-<p class="description">the optimized HTTP/1.x, HTTP/2 server</p>
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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> &gt;
-Proxy Directives
-</h2>
-
-
-<p>
-Proxy module is the reverse proxy implementation for H2O - it implements a HTTP client that forwards a HTTP request to an upstream server.
-</p>
-<p>
-When forwarding the requests, the module sets following request headers:
-<ul>
-<li><a href="https://tools.ietf.org/html/rfc7230#section-5.7.1">via</a></li>
-<li><a href="http://docs.aws.amazon.com/ElasticLoadBalancing/latest/DeveloperGuide/x-forwarded-headers.html#x-forwarded-for">x-forwarded-for</a></li>
-<li><a href="http://docs.aws.amazon.com/ElasticLoadBalancing/latest/DeveloperGuide/x-forwarded-headers.html#x-forwarded-proto">x-forwarded-proto</a></li>
-</ul>
-</p>
-<p>
-The HTTP client only supports HTTP/1.
-Support for HTTPS has been introduced in version 2.0.
-</p>
-<p>
-Following sections describe the configuration directives defined for the module.
-</p>
-
-<div id="proxy.reverse.url" class="directive-head">
-<h3><a href="configure/proxy_directives.html#proxy.reverse.url"><code>"proxy.reverse.url"</code></a></h3>
-</div>
-
-<dl class="directive-desc">
-<dt>Description:</dt>
-<dd>
-<p>
-Forwards the requests to the specified URL, and proxies the response.
-</p>
-
-<div class="example">
-<div class="caption">Example. Forwarding the requests to application server running on <code>127.0.0.1:8080</code></div>
-<pre><code>proxy.reverse.url: &quot;http://127.0.0.1:8080/&quot;
-</code></pre>
-</div>
-
-<p>
-If you want load balancing multiple backends, replace 127.0.0.1 with hostname which returns IP addresses via DNS or /etc/hosts.
-</p>
-<p>
-In addition to TCP/IP over IPv4 and IPv6, the proxy handler can also connect to an HTTP server listening to a Unix socket.
-Path to the unix socket should be surrounded by square brackets, and prefixed with <code>unix:</code> (e.g. <code>http://[unix:/path/to/socket]/path</code>).
-</p>
-
-
-</dd>
-<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
-<dd>path</dd>
-</dl>
-
-<div id="proxy.preserve-host" class="directive-head">
-<h3><a href="configure/proxy_directives.html#proxy.preserve-host"><code>"proxy.preserve-host"</code></a></h3>
-</div>
-
-<dl class="directive-desc">
-<dt>Description:</dt>
-<dd>
-<p>
-A boolean flag (<code>ON</code> or <code>OFF</code>) designating whether or not to pass <code>Host</code> header from incoming request to upstream.
-</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>proxy.preserve-host: OFF</pre></code>
-</dl>
-
-
-<div id="proxy.preserve-x-forwarded-proto" class="directive-head">
-<div class="directive-since">since v2.0</div>
-<h3><a href="configure/proxy_directives.html#proxy.preserve-x-forwarded-proto"><code>"proxy.preserve-x-forwarded-proto"</code></a></h3>
-</div>
-
-<dl class="directive-desc">
-<dt>Description:</dt>
-<dd>
-<p>
-A boolean flag(<code>ON</code> or <code>OFF</code>) indicating if the server preserve the received <code>x-forwarded-proto</code> request header.
-</p>
-
-<p>
-By default, when transmitting a HTTP request to an upstream HTTP server, H2O removes the received <code>x-forwarded-proto</code> request header and sends its own, as a precaution measure to prevent an attacker connecting through HTTP to lie that they are connected via HTTPS.
-However in case H2O is run behind a trusted HTTPS proxy, such protection might not be desirable, and this configuration directive can be used to modify the behaviour.
-</p>
-
-</dd>
-<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
-<dd>global</dd>
-<dt>Default:</dt>
-<dd><code><pre>proxy.preserve-x-forwarded-proto: OFF</pre></code>
-</dl>
-
-<div id="proxy.proxy-protocol" class="directive-head">
-<div class="directive-since">since v2.1</div>
-<h3><a href="configure/proxy_directives.html#proxy.proxy-protocol"><code>"proxy.proxy-protocol"</code></a></h3>
-</div>
-
-<dl class="directive-desc">
-<dt>Description:</dt>
-<dd>
-<p>
-A boolean flag (<code>ON</code> or <code>OFF</code>) indicating if <a href="http://www.haproxy.org/download/1.5/doc/proxy-protocol.txt" target="_blank">PROXY protocol</a> should be used when connecting to the application server.
-</p>
-
-<p>
-When using the PROXY protocol, connections to the application server cannot be persistent (i.e. <a href="configure/proxy_directives.html#proxy.timeout.keepalive"><code>proxy.timeout.keepalive</code></a> must be set to zero).
-</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>proxy.proxy-protocol: OFF</pre></code>
-<dt>See also:</dt>
-<dd><a href="configure/proxy_directives.html#proxy.timeout.keepalive"><code>proxy.timeout.keepalive</code></a>
-</dd>
-</dl>
-
-<div id="proxy.emit-x-forwarded-headers" class="directive-head">
-<div class="directive-since">since v2.1</div>
-<h3><a href="configure/proxy_directives.html#proxy.emit-x-forwarded-headers"><code>"proxy.emit-x-forwarded-headers"</code></a></h3>
-</div>
-
-<dl class="directive-desc">
-<dt>Description:</dt>
-<dd>
-<p>
-A boolean flag(<code>ON</code> or <code>OFF</code>) indicating if the server will append or add the <code>x-forwarded-proto</code> and <code>x-forwarded-for</code> request headers.
-</p>
-
-<p>
-By default, when forwarding an HTTP request H2O sends its own <code>x-forwarded-proto</code> and <code>x-forwarded-for</code> request headers (or might append its value in the <code>x-forwarded-proto</code> case, see <code>proxy.preserve-x-forwarded-proto</code>). This might not be always desirable. Please keep in mind security implications when setting this of <code>OFF</code>, since it might allow an attacker to spoof the originator or the protocol of a request.
-</p>
-
-</dd>
-<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
-<dd>global</dd>
-<dt>Default:</dt>
-<dd><code><pre>proxy.emit-x-forwarded-headers: ON</pre></code>
-<dt>See also:</dt>
-<dd><a href="configure/proxy_directives.html#proxy.emit-via-header"><code>proxy.emit-via-header</code></a>
-</dd>
-</dl>
-
-<div id="proxy.emit-via-header" class="directive-head">
-<div class="directive-since">since v2.2</div>
-<h3><a href="configure/proxy_directives.html#proxy.emit-via-header"><code>"proxy.emit-via-header"</code></a></h3>
-</div>
-
-<dl class="directive-desc">
-<dt>Description:</dt>
-<dd>
-<p>
-A boolean flag (<code>ON</code> or <code>OFF</code>) indicating if the server adds or appends an entry to the <code>via</code> request header.
-</p>
-
-</dd>
-<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
-<dd>global</dd>
-<dt>Default:</dt>
-<dd><code><pre>proxy.emit-via-header: ON</pre></code>
-<dt>See also:</dt>
-<dd><a href="configure/proxy_directives.html#proxy.emit-x-forwarded-headers"><code>proxy.emit-x-forwarded-headers</code></a>
-</dd>
-</dl>
-
-
-<div id="proxy.header.add" class="directive-head">
-<div class="directive-since">since v2.2</div>
-<h3><a href="configure/proxy_directives.html#proxy.header.add"><code>"proxy.header.add"</code></a></h3>
-</div>
-
-<dl class="directive-desc">
-<dt>Description:</dt>
-<dd>
-<p>
-Modifies the request headers sent to the application server.
-</p>
-
-<p>
-The behavior is identical to <a href="configure/headers_directives.html#header.add"><code>header.add</code></a> except for the fact that it affects the request sent to the application server.
-Please refer to the documentation of the <a href="configure/headers_directives.html">headers handler</a> to see how the directives can be used to mangle the headers.
-</p>
-
-</dd>
-<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
-<dd>global, host, path, extensions</dd>
-</dl>
-<div id="proxy.header.append" class="directive-head">
-<div class="directive-since">since v2.2</div>
-<h3><a href="configure/proxy_directives.html#proxy.header.append"><code>"proxy.header.append"</code></a></h3>
-</div>
-
-<dl class="directive-desc">
-<dt>Description:</dt>
-<dd>
-<p>
-Modifies the request headers sent to the application server.
-</p>
-
-<p>
-The behavior is identical to <a href="configure/headers_directives.html#header.append"><code>header.append</code></a> except for the fact that it affects the request sent to the application server.
-Please refer to the documentation of the <a href="configure/headers_directives.html">headers handler</a> to see how the directives can be used to mangle the headers.
-</p>
-
-</dd>
-<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
-<dd>global, host, path, extensions</dd>
-</dl>
-<div id="proxy.header.merge" class="directive-head">
-<div class="directive-since">since v2.2</div>
-<h3><a href="configure/proxy_directives.html#proxy.header.merge"><code>"proxy.header.merge"</code></a></h3>
-</div>
-
-<dl class="directive-desc">
-<dt>Description:</dt>
-<dd>
-<p>
-Modifies the request headers sent to the application server.
-</p>
-
-<p>
-The behavior is identical to <a href="configure/headers_directives.html#header.merge"><code>header.merge</code></a> except for the fact that it affects the request sent to the application server.
-Please refer to the documentation of the <a href="configure/headers_directives.html">headers handler</a> to see how the directives can be used to mangle the headers.
-</p>
-
-</dd>
-<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
-<dd>global, host, path, extensions</dd>
-</dl>
-<div id="proxy.header.set" class="directive-head">
-<div class="directive-since">since v2.2</div>
-<h3><a href="configure/proxy_directives.html#proxy.header.set"><code>"proxy.header.set"</code></a></h3>
-</div>
-
-<dl class="directive-desc">
-<dt>Description:</dt>
-<dd>
-<p>
-Modifies the request headers sent to the application server.
-</p>
-
-<p>
-The behavior is identical to <a href="configure/headers_directives.html#header.set"><code>header.set</code></a> except for the fact that it affects the request sent to the application server.
-Please refer to the documentation of the <a href="configure/headers_directives.html">headers handler</a> to see how the directives can be used to mangle the headers.
-</p>
-
-</dd>
-<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
-<dd>global, host, path, extensions</dd>
-</dl>
-<div id="proxy.header.setifempty" class="directive-head">
-<div class="directive-since">since v2.2</div>
-<h3><a href="configure/proxy_directives.html#proxy.header.setifempty"><code>"proxy.header.setifempty"</code></a></h3>
-</div>
-
-<dl class="directive-desc">
-<dt>Description:</dt>
-<dd>
-<p>
-Modifies the request headers sent to the application server.
-</p>
-
-<p>
-The behavior is identical to <a href="configure/headers_directives.html#header.setifempty"><code>header.setifempty</code></a> except for the fact that it affects the request sent to the application server.
-Please refer to the documentation of the <a href="configure/headers_directives.html">headers handler</a> to see how the directives can be used to mangle the headers.
-</p>
-
-</dd>
-<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
-<dd>global, host, path, extensions</dd>
-</dl>
-<div id="proxy.header.unset" class="directive-head">
-<div class="directive-since">since v2.2</div>
-<h3><a href="configure/proxy_directives.html#proxy.header.unset"><code>"proxy.header.unset"</code></a></h3>
-</div>
-
-<dl class="directive-desc">
-<dt>Description:</dt>
-<dd>
-<p>
-Modifies the request headers sent to the application server.
-</p>
-
-<p>
-The behavior is identical to <a href="configure/headers_directives.html#header.unset"><code>header.unset</code></a> except for the fact that it affects the request sent to the application server.
-Please refer to the documentation of the <a href="configure/headers_directives.html">headers handler</a> to see how the directives can be used to mangle the headers.
-</p>
-
-</dd>
-<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
-<dd>global, host, path, extensions</dd>
-</dl>
-
-
-<div id="proxy.ssl.cafile" class="directive-head">
-<div class="directive-since">since v2.0</div>
-<h3><a href="configure/proxy_directives.html#proxy.ssl.cafile"><code>"proxy.ssl.cafile"</code></a></h3>
-</div>
-
-<dl class="directive-desc">
-<dt>Description:</dt>
-<dd>
-<p>
-Specifies the file storing the list of trusted root certificates.
-</p>
-
-<p>
-By default, H2O uses <code>share/h2o/ca-bundle.crt</code>. The file contains a set of trusted root certificates maintained by Mozilla, downloaded and converted using <a href="https://curl.haxx.se/docs/mk-ca-bundle.html">mk-ca-bundle.pl</a>.
-</p>
-
-</dd>
-<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
-<dd>global, host, path, extension</dd>
-<dt>See also:</dt>
-<dd><a href="configure/proxy_directives.html#proxy.ssl.verify-peer"><code>proxy.ssl.verify-peer</code></a>
-</dd>
-</dl>
-
-<div id="proxy.ssl.session-cache" class="directive-head">
-<div class="directive-since">since v2.1</div>
-<h3><a href="configure/proxy_directives.html#proxy.ssl.session-cache"><code>"proxy.ssl.session-cache"</code></a></h3>
-</div>
-
-<dl class="directive-desc">
-<dt>Description:</dt>
-<dd>
-<p>
-Specifies whether if and how a session cache should be used for TLS connections to the application server.
-</p>
-
-<p>
-Since version 2.1, result of the TLS handshakes to the application server is memoized and later used to resume the connection, unless set to <code>OFF</code> using this directive.
-If the value is a mapping, then the following two attributes must be specified:
-<dl>
-<dt>lifetime:</dt>
-<dd>validity of session cache entries in seconds</dd>
-<dt>capacity:</dt>
-<dd>maxmum number of entries to be kept in the session cache</dd>
-</dl>
-If set to <code>ON</code>, <code>lifetime</code> and <code>capacity</code> will be set to 86,400 (one day) and 4,096.
-</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>proxy.ssl.session-cache: ON</pre></code>
-</dl>
-
-<div id="proxy.ssl.verify-peer" class="directive-head">
-<div class="directive-since">since v2.0</div>
-<h3><a href="configure/proxy_directives.html#proxy.ssl.verify-peer"><code>"proxy.ssl.verify-peer"</code></a></h3>
-</div>
-
-<dl class="directive-desc">
-<dt>Description:</dt>
-<dd>
-<p>
-A boolean flag (<code>ON</code> or <code>OFF</code>) indicating if the server certificate and hostname should be verified.
-</p>
-
-<p>
-If set to <code>ON</code>, the HTTP client implementation of H2O verifies the peer's certificate using the list of trusted certificates as well as compares the hostname presented in the certificate against the connecting hostname.
-</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>proxy.ssl.verify-peer: ON</pre></code>
-<dt>See also:</dt>
-<dd><a href="configure/proxy_directives.html#proxy.ssl.cafile"><code>proxy.ssl.cafile</code></a>
-</dd>
-</dl>
-
-<div id="proxy.timeout.io" class="directive-head">
-<h3><a href="configure/proxy_directives.html#proxy.timeout.io"><code>"proxy.timeout.io"</code></a></h3>
-</div>
-
-<dl class="directive-desc">
-<dt>Description:</dt>
-<dd>
-<p>
-Sets the upstream I/O timeout in milliseconds.
-</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>proxy.timeout.io: 30000</pre></code>
-</dl>
-
-
-<div id="proxy.timeout.keepalive" class="directive-head">
-<h3><a href="configure/proxy_directives.html#proxy.timeout.keepalive"><code>"proxy.timeout.keepalive"</code></a></h3>
-</div>
-
-<dl class="directive-desc">
-<dt>Description:</dt>
-<dd>
-<p>
-Sets the upstream timeout for idle connections in milliseconds.
-</p>
-
-<p>
-Upstream connection becomes non-persistent if the value is set to zero.
-The value should be set to something smaller than that being set at the upstream server.
-</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>proxy.timeout.keepalive: 2000</pre></code>
-</dl>
-
-<div id="proxy.websocket" class="directive-head">
-<h3><a href="configure/proxy_directives.html#proxy.websocket"><code>"proxy.websocket"</code></a></h3>
-</div>
-
-<dl class="directive-desc">
-<dt>Description:</dt>
-<dd>
-<p>
-A boolean flag (<code>ON</code> or <code>OFF</code>) indicating whether or not to allow upgrading the proxied connection to <a href="https://tools.ietf.org/html/rfc6455">the WebSocket protocol</a>.
-</p>
-
-<p>
-When set to <code>ON</code>, the proxied connection will be upgraded to a bi-directional tunnel stream if upgrading to WebSocket connection is permitted by the backend server (i.e. if the backend server responds to a WebSocket handshake with <code>101</code> status code).
-</p>
-<p>
-Support for WebSocket is considered experimental for the time being and therefore is not yet turned on by default.
-</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>proxy.websocket: OFF</pre></code>
-</dl>
-
-<div id="proxy.websocket.timeout" class="directive-head">
-<h3><a href="configure/proxy_directives.html#proxy.websocket.timeout"><code>"proxy.websocket.timeout"</code></a></h3>
-</div>
-
-<dl class="directive-desc">
-<dt>Description:</dt>
-<dd>
-<p>
-Sets idle timeout of a WebSocket connection being proxied.
-</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>proxy.websocket.timeout: 300000</pre></code>
-</dl>
-
-
-
-
-
-</div>
-<div id="footer">
-<p>
-Copyright &copy; 2015 <a href="http://dena.com/intl/">DeNA Co., Ltd.</a> et al.
-</p>
-</div>
-</body>
-</html>