首先，我们用webpy写一个简单的网站，监听8080端口，返回“Hello, EverET.org”的页面。
然后我们使用我们的forwarding.py，在80端口和8080端口中间建立两条通信管道用于双向通信。
此时，我们通过80端口访问我们的服务器。
浏览器得到：
然后，我们在forwarding.py的输出结果中可以看到浏览器和webpy之间的通信内容。
代码：
#!/usr/bin/env pythonimport sys, socket, time, threadingloglock = threading.Lock()def log(msg): loglock.acquire() try: print '[%s]: n%sn' % (time.ctime(), msg.strip()) sys.stdout.flush() finally: loglock.release()class PipeThread(threading.Thread): def __init__(self, source, target): threading.Thread.__init__(self) self.source = source self.target = target def run(self): while True: try: data = self.source.recv(1024) log(data) if not data: break self.target.send(data) except: break log('PipeThread done')class Forwarding(threading.Thread): def __init__(self, port, targethost, targetport): threading.Thread.__init__(self) self.targethost = targethost self.targetport = targetport self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) self.sock.bind(('0.0.0.0', port)) self.sock.listen(10) def run(self): while True: client_fd, client_addr = self.sock.accept() target_fd = socket.socket(socket.AF_INET, socket.SOCK_STREAM) target_fd.connect((self.targethost, self.targetport)) log('new connect') # two direct pipe PipeThread(target_fd, client_fd).start() PipeThread(client_fd, target_fd).start()if __name__ == '__main__': print 'Starting' import sys try: port = int(sys.argv[1]) targethost = sys.argv[2] try: targetport = int(sys.argv[3]) except IndexError: targetport = port except (ValueError, IndexError): print 'Usage: %s port targethost [targetport]' % sys.argv[0] sys.exit(1) #sys.stdout = open('forwaring.log', 'w') Forwarding(port, targethost, targetport).start()