: Proxy( address, port = 80 )
    ˻ꤵ줿ץ³륯饹֤ޤ
    Υ饹 Net::HTTP ѾƤΤ Net::HTTP 
    Ʊ褦˻Ȥޤ

    address  nil ΤȤ Net::HTTP 饹򤽤Τޤ֤ޤ

        # example
        proxy_class = Net::HTTP::Proxy( 'proxy.foo.org', 8080 )
                        :
        proxy_class.start( 'www.ruby-lang.org' ) {|http|
            # connecting proxy.foo.org:8080
                        :
        }

