使用Go语言编写HTTP代理服务器

package?main

import?(

"io"?

"log"?

"net"?

"net/http"?

)

func?handleRequest(w http.ResponseWriter, r *http.Request)?{

// 创建到目标服务器的连接

destConn, err := net.Dial("tcp", r.Host)

if?err != nil?{

log.Printf("无法连接到目标服务器: %v", err)

http.Error(w, "无法连接到目标服务器", http.StatusInternalServerError)

return?

}

defer?destConn.Close()

// 将客户端的请求发送到目标服务器

err = r.Write(destConn)

if?err != nil?{

log.Printf("请求发送失败: %v", err)

http.Error(w, "请求发送失败", http.StatusInternalServerError)

return?

}

// 将目标服务器的响应返回给客户端

buf := make([]byte, 4096)

for?{

n, err := destConn.Read(buf)

if?err != nil?&& err != io.EOF {

log.Printf("读取响应时出错: %v", err)

http.Error(w, "读取响应时出错", http.StatusInternalServerError)

return?

}

if?n == 0?{

break?

}

_, err = w.Write(buf[:n])

if?err != nil?{

log.Printf("响应写入失败: %v", err)

http.Error(w, "响应写入失败", http.StatusInternalServerError)

return?

}

}

}

func?main()?{

// 创建HTTP代理服务器

proxy := &http.Server{

Addr: ":8080", // 代理服务器监听的端口号，可以根据需要进行修改

Handler: http.HandlerFunc(handleRequest),

}

log.Println("启动HTTP代理服务器，监听端口8080...")

err := proxy.ListenAndServe()

if?err != nil?{

log.Fatalf("代理服务器启动失败: %v", err)

}

}