mod_proxy.html.en

Apache 2.0.63 is the current stable version of the 2.0 series, and is recommended over any previous

    (the functionality <code>ProxyPass</code> provides here). It also takes care
    of redirects the server <code>backend.example.com</code> sends: when
    <code>http://backend.example.com/bar</code> is redirected by him to
    <code>http://backend.example.com/quux</code> Apache adjusts this to
    <code>http://example.com/mirror/foo/quux</code> before forwarding the HTTP
    redirect response to the client. Note that the hostname used for
    constructing the URL is chosen in respect to the setting of the <code class="directive"><a href="../mod/core.html#usecanonicalname">UseCanonicalName</a></code> directive.</p>

    <p>Note that this <code class="directive">ProxyPassReverse</code> directive can
    also be used in conjunction with the proxy pass-through feature
    (<code>RewriteRule ...  [P]</code>) from <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code>
    because its doesn't depend on a corresponding <code class="directive"><a href="#proxypass">ProxyPass</a></code> directive.</p>

    <p>When used inside a <code class="directive"><a href="../mod/core.html#location">&lt;Location&gt;</a></code> section, the first argument is omitted and the local
    directory is obtained from the <code class="directive"><a href="../mod/core.html#location">&lt;Location&gt;</a></code>.</p>

</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="ProxyPreserveHost" id="ProxyPreserveHost">ProxyPreserveHost</a> <a name="proxypreservehost" id="proxypreservehost">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Use incoming Host HTTP request header for proxy
request</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyPreserveHost On|Off</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxyPreserveHost Off</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.0.31 and later.</td></tr>
</table>
    <p>When enabled, this option will pass the Host: line from the incoming
    request to the proxied host, instead of the hostname specified in the
    proxypass line.</p>

    <p>This option should normally be turned <code>Off</code>. It is mostly 
    useful in special configurations like proxied mass name-based virtual
    hosting, where the original Host header needs to be evaluated by the
    backend server.</p>

</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="ProxyReceiveBufferSize" id="ProxyReceiveBufferSize">ProxyReceiveBufferSize</a> <a name="proxyreceivebuffersize" id="proxyreceivebuffersize">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Network buffer size for proxied HTTP and FTP
connections</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyReceiveBufferSize <var>bytes</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxyReceiveBufferSize 0</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy</td></tr>
</table>
    <p>The <code class="directive">ProxyReceiveBufferSize</code> directive specifies an
    explicit (TCP/IP) network buffer size for proxied HTTP and FTP connections,
    for increased throughput. It has to be greater than <code>512</code> or set
    to <code>0</code> to indicate that the system's default buffer size should
    be used.</p>

    <div class="example"><h3>Example</h3><p><code>
      ProxyReceiveBufferSize 2048
    </code></p></div>

</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="ProxyRemote" id="ProxyRemote">ProxyRemote</a> <a name="proxyremote" id="proxyremote">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Remote proxy used to handle certain requests</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyRemote <var>match</var> <var>remote-server</var></code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy</td></tr>
</table>
    <p>This defines remote proxies to this proxy. <var>match</var> is either the
    name of a URL-scheme that the remote server supports, or a partial URL
    for which the remote server should be used, or <code>*</code> to indicate
    the server should be contacted for all requests. <var>remote-server</var> is
    a partial URL for the remote server. Syntax:</p>

    <div class="example"><p><code>
      <dfn>remote-server</dfn> =
          <var>scheme</var>://<var>hostname</var>[:<var>port</var>]
    </code></p></div>

    <p><var>scheme</var> is effectively the protocol that should be used to
    communicate with the remote server; only <code>http</code> is supported by
    this module.</p>

    <div class="example"><h3>Example</h3><p><code>
      ProxyRemote http://goodguys.com/ http://mirrorguys.com:8000<br />
      ProxyRemote * http://cleversite.com<br />
      ProxyRemote ftp http://ftpproxy.mydomain.com:8080
    </code></p></div>

    <p>In the last example, the proxy will forward FTP requests, encapsulated
    as yet another HTTP proxy request, to another proxy which can handle
    them.</p>

    <p>This option also supports reverse proxy configuration - a backend
    webserver can be embedded within a virtualhost URL space even if that
    server is hidden by another forward proxy.</p>

</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="ProxyRemoteMatch" id="ProxyRemoteMatch">ProxyRemoteMatch</a> <a name="proxyremotematch" id="proxyremotematch">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Remote proxy used to handle requests matched by regular
expressions</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyRemoteMatch <var>regex</var> <var>remote-server</var></code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy</td></tr>
</table>
    <p>The <code class="directive">ProxyRemoteMatch</code> is identical to the
    <code class="directive"><a href="#proxyremote">ProxyRemote</a></code> directive, except the
    first argument is a regular expression match against the requested URL.</p>

</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="ProxyRequests" id="ProxyRequests">ProxyRequests</a> <a name="proxyrequests" id="proxyrequests">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enables forward (standard) proxy requests</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyRequests On|Off</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxyRequests Off</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy</td></tr>
</table>
    <p>This allows or prevents Apache from functioning as a forward proxy
    server. (Setting ProxyRequests to <code>Off</code> does not disable use of
    the <code class="directive"><a href="#proxypass">ProxyPass</a></code> directive.)</p>

    <p>In a typical reverse proxy configuration, this option should be set to
    <code>Off</code>.</p>

    <p>In order to get the functionality of proxying HTTP or FTP sites, you
    need also <code class="module"><a href="../mod/mod_proxy_http.html">mod_proxy_http</a></code> or <code class="module"><a href="../mod/mod_proxy_ftp.html">mod_proxy_ftp</a></code>
    (or both) present in the server.</p>

    <div class="warning"><h3>Warning</h3>
      <p>Do not enable proxying with <code class="directive"><a href="#proxyrequests">ProxyRequests</a></code> until you have <a href="#access">secured your server</a>.  Open proxy servers are dangerous
      both to your network and to the Internet at large.</p>
    </div>

</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="ProxyTimeout" id="ProxyTimeout">ProxyTimeout</a> <a name="proxytimeout" id="proxytimeout">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Network timeout for proxied requests</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyTimeout <var>seconds</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxyTimeout 300</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.0.31 and later</td></tr>
</table>
    <p>This directive allows a user to specifiy a timeout on proxy requests.
    This is useful when you have a slow/buggy appserver which hangs, and you
    would rather just return a timeout and fail gracefully instead of waiting
    however long it takes the server to return.</p>

</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="ProxyVia" id="ProxyVia">ProxyVia</a> <a name="proxyvia" id="proxyvia">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Information provided in the <code>Via</code> HTTP response
header for proxied requests</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyVia On|Off|Full|Block</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxyVia Off</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy</td></tr>
</table>
    <p>This directive controls the use of the <code>Via:</code> HTTP
    header by the proxy. Its intended use is to control the flow of of
    proxy requests along a chain of proxy servers.  See <a href="http://www.ietf.org/rfc/rfc2616.txt">RFC 2616</a> (HTTP/1.1), section
    14.45 for an explanation of <code>Via:</code> header lines.</p>

    <ul>
    <li>If set to <code>Off</code>, which is the default, no special processing
    is performed. If a request or reply contains a <code>Via:</code> header,
    it is passed through unchanged.</li>

    <li>If set to <code>On</code>, each request and reply will get a
    <code>Via:</code> header line added for the current host.</li>

    <li>If set to <code>Full</code>, each generated <code>Via:</code> header
    line will additionally have the Apache server version shown as a
    <code>Via:</code> comment field.</li>

    <li>If set to <code>Block</code>, every proxy request will have all its
    <code>Via:</code> header lines removed. No new <code>Via:</code> header will
    be generated.</li>
    </ul>

</div>
</div>
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