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Next: <a rel="next" accesskey="n" href="SOCKS-parent-proxies.html#SOCKS-parent-proxies">SOCKS parent proxies</a>,
Previous: <a rel="previous" accesskey="p" href="Parent-proxies.html#Parent-proxies">Parent proxies</a>,
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<h4 class="subsection">3.10.1 HTTP parent proxies</h4>
<p><a name="index-parentProxy-162"></a><a name="index-parentAuthCredentials-163"></a><a name="index-parent-proxy-164"></a><a name="index-upstream-proxy-165"></a><a name="index-firewall-166"></a><a name="index-authentication-167"></a>
The variable <code>parentProxy</code> specifies the hostname and port number
of an HTTP parent proxy; it should have the form ‘<samp><span class="samp">host:port</span></samp>’.
<p>If the parent proxy requires authorisation, the username and password
should be specified in the variable <code>parentAuthCredentials</code> in
the form ‘<samp><span class="samp">username:password</span></samp>’. Only <em>Basic</em> authentication
is supported, which is vulnerable to replay attacks.
<p>The main application of the parent proxy support is to cross
firewalls. Given a machine, say <code>trurl</code>, with unrestricted
access to the web, the following evades a firewall by using an
encrypted compressed <code>ssh</code> link:
<pre class="example"> $ ssh -f -C -L 8124:localhost:8123 trurl polipo
$ polipo parentProxy=localhost:8124
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