用Python写一个类似frp的 反向代理程序。本地网页127.0.0.1：8899，以及云端服务器公网访问的网页7.120.52.14：8080

可以使用Python的socket模块和多线程来实现一个简单的反向代理程序。以下是一个示例代码：

import socket
import threading

class ReverseProxy:
    def __init__(self, local_host, local_port, remote_host, remote_port):
        self.local_host = local_host
        self.local_port = local_port
        self.remote_host = remote_host
        self.remote_port = remote_port

    def start(self):
        server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        server_socket.bind((self.local_host, self.local_port))
        server_socket.listen(5)
        print(f"Proxy server started on {self.local_host}:{self.local_port}")

        while True:
            client_socket, addr = server_socket.accept()
            print(f"Accepted connection from {addr[0]}:{addr[1]}")
            proxy_thread = threading.Thread(target=self.proxy_handler, args=(client_socket,))
            proxy_thread.start()

    def proxy_handler(self, client_socket):
        remote_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        remote_socket.connect((self.remote_host, self.remote_port))

        while True:
            data = client_socket.recv(4096)
            if len(data) == 0:
                break
            remote_socket.send(data)

            remote_data = remote_socket.recv(4096)
            if len(remote_data) == 0:
                break
            client_socket.send(remote_data)

        client_socket.close()
        remote_socket.close()

if __name__ == "__main__":
    proxy = ReverseProxy("127.0.0.1", 8899, "7.120.52.14", 8080)
    proxy.start()

这段代码创建了一个名为ReverseProxy的类，它初始化了本地和远程主机以及端口。start()方法启动了代理服务器，监听本地主机和端口，接受客户端连接。proxy_handler()方法处理代理逻辑，将客户端请求发送到远程主机，并将远程主机的响应发送回客户端。

你可以将本地主机和端口设置为127.0.0.1:8899，将远程主机和端口设置为7.120.52.14:8080。然后运行这个程序，它将会将本地网页127.0.0.1:8899上的请求转发到云端服务器公网访问的网页7.120.52.14:8080上。