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http_proxy.pl -- Use HTTP network proxies
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This module provides a plugin for tcp_connect/3 to realise TCP connections through an HTTP proxy that supports the HTTP 1.1 CONNECT method.

Source socket:try_proxy(+Proxy, +Address, -Socket, -StreamPair)[multifile]
Connection is via an HTTP proxy for socket: Use HTTP CONNECT. Note that most proxies will only support this for connecting on port 443
Proxy- is of the form proxy(Host, Port)
- proxy_error(Message) if the proxy connection is not successful.