GNU Proxyknife (formerly known as phc or proxy hunter customed) is a program to validate free proxies for LAN users to reach the Internet by bypassing ISP proxies with strict limits. It can be customized to change headers (such as User_Agent) in test requests sent to free proxies. You can also customize it with your own checksite, checksite port, or checksite key, switch between the CONNECT and GET method, etc., to test and filter free proxies. It can be used to validate free socks5 proxies with a connect command, socks4 proxies with a connect command or free HTTP proxies with a GET or CONNECT method. It can validate free proxies with a TCP tunnel.
