http_proxy.go

package main

import (
	"bufio"
	"fmt"
	"io"
	"log"
	"net"
	"strings"
)

func main() {
	listener, err := net.Listen("tcp", ":8080")
	if err != nil {
		log.Fatal("Failed to start server:", err)
	}
	defer listener.Close()

	fmt.Println("Proxy server listening on :8080")

	for {
		conn, err := listener.Accept()
		if err != nil {
			log.Println("Failed to accept connection:", err)
			continue
		}
		go handleConnection(conn)
	}
}

func handleConnection(clientConn net.Conn) {
	defer clientConn.Close()

	reader := bufio.NewReader(clientConn)
	requestLine, err := reader.ReadString('\n')
	if err != nil {
		log.Println("Error reading request:", err)
		return
	}

	parts := strings.Split(requestLine, " ")
	if len(parts) != 3 {
		log.Println("Invalid request line:", requestLine)
		return
	}

	host := parts[1]
	if !strings.HasPrefix(host, "http://") {
		host = "http://" + host
	}

	targetConn, err := net.Dial("tcp", host[7:])
	if err != nil {
		log.Println("Failed to connect to target:", err)
		return
	}
	defer targetConn.Close()

	// Forward the request to the target server
	fmt.Fprintf(targetConn, "%s", requestLine)
	go io.Copy(targetConn, reader)

	// Forward the response back to the client
	io.Copy(clientConn, targetConn)
}