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<h3 class="section">3.12 Tunnelling connections</h3>
<p><a name="index-tunnel-175"></a><a name="index-tunnelling-proxy-176"></a><a name="index-https-177"></a><a name="index-HTTP_002fSSL-178"></a><a name="index-rsync-179"></a><a name="index-CONNECT-180"></a><a name="index-tunnelAllowedPorts-181"></a>
Polipo is an HTTP proxy; it proxies HTTP traffic, and clients using
other protocols should either establish a direct connection to the
server or use an <em>ad hoc</em> proxy.
<p>In many circumstances, however, it is not possible to establish
a direct connection to the server, for example due to mis-configured
firewalls or when trying to access the IPv4 Internet from an IPv6-only
host. In such situations, it is possible to have Polipo behave as
a <em>tunnelling</em> proxy — a proxy that merely forwards traffic
between the client and the server without understanding it. Polipo
enters tunnel mode when the client requests it by using the HTTP
‘<samp><span class="samp">CONNECT</span></samp>’ method.
<p>Most web browsers will use this technique for HTTP over SSL if
configured to use Polipo as their `https proxy'. More generally, the
author has successfully used it to cross mis-configured firewalls
using OpenSSH, rsync, Jabber, IRC, etc.
<p>The variable <code>tunnelAllowedPorts</code> specifies the set of ports that
Polipo will accept to tunnel traffic to. It defaults to allowing ssh,
HTTP, https, rsync, IMAP, imaps, POP, pops, Jabber, CVS and Git traffic.
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