HTTP_ProxyGet.go

/*
HTTP_ProxyGet

通过代理发起http请求

运行 (代码ip在网上搜索)：
go run HTTP_ProxyGet.go http://139.59.81.158 http://google.com
*/
package main

import (
	"fmt"
	"net/http"
	"net/http/httputil"
	"net/url"
	"os"
)

func main() {
	if len(os.Args) != 3 {
		fmt.Println("Usage: ", os.Args[0], "http://proxy-host:port http://host:port/page")
		os.Exit(1)
	}

	// 解析代理url
	proxyString := os.Args[1]
	proxyURL, err := url.Parse(proxyString)
	checkError(err)

	// 解析目标url
	rawURL := os.Args[2]
	url, err := url.Parse(rawURL)
	checkError(err)

	// 构建带proxy的client
	transport := &http.Transport{Proxy: http.ProxyURL(proxyURL)}
	client := &http.Client{Transport: transport}

	request, err := http.NewRequest("GET", url.String(), nil)
	dump, _ := httputil.DumpRequest(request, false)
	fmt.Println(string(dump))

	response, err := client.Do(request)
	checkError(err)

	fmt.Println("Read ok")

	if response.Status != "200 OK" {
		fmt.Println(response.Status)
		os.Exit(2)
	}
	fmt.Println("Response ok")

	var buf [512]byte
	reader := response.Body
	for {
		n, err := reader.Read(buf[0:])
		fmt.Println(string(buf[0:n]))
		if err != nil {
			os.Exit(0)
		}
	}

	os.Exit(0)
}

func checkError(err error) {
	if err != nil {
		fmt.Println("Fatal error ", err.Error())
		os.Exit(1)
	}
}