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Example: >>> proxy = urllib3.ProxyManager('http://localhost:3128/') >>> r1 = proxy.request('GET', 'http://google.com/') >>> r2 = proxy.request('GET', 'http://httpbin.org/') >>> len(proxy.pools) 1 >>> r3 = proxy.request('GET', 'https://httpbin.org/') >>> r4 = proxy.request('GET', 'https://twitter.com/') >>> len(proxy.pools) 3 r:NFc  st|trd|j|j|jf}t|}|jdvr:t|j|jsZt|jd} |j | d}||_ |pfi|_ ||_ t |||_|j |d<|j |d<|j|d<tt|j||fi|dS)Nz %s://%s:%ir7rS)rO_proxyr$ _proxy_config)rsrr!r"rOrr rr*_replacerc proxy_headersproxy_ssl_contextr rdsuperrrA) rF proxy_urlrGr#rrrrBrcrO __class__r4r5rAs(         zProxyManager.__init__r8csD|dkr tt|j||||dStt|j|jj|jj|jj|dS)Nr9)rV)rrrWrcr"rOr!)rFr"rOr!rVrr4r5rWs  z!ProxyManager.connection_from_hostcCs0ddi}t|j}|r||d<|r,|||S)z Sets headers needed by proxies: specifically, the Accept and Host headers. Only sets headers not provided by the user. 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