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net/httpでSOCKS proxyを扱う

Last updated at Posted at 2014-07-22

GoはデフォルトではHTTP_PROXY環境変数を使うことでHTTP Proxyを使うことが出来るのですが、SOCKSは対応していません。

hailiang/socksがSOCKSのライブラリを適用してくれているのでTransportに突っ込むことでSOCKS経由で通信することができます。

mkdir -p go-socks-example/src
cd go-socks-exmaple
export GOPATH=`pwd`
go get -u "github.com/hailiang/socks"
package main

import (
	"fmt"
	"github.com/hailiang/socks"
	"io/ioutil"
	"net/http"
)

func main() {
	dialSocksProxy := socks.DialSocksProxy(socks.SOCKS5, "127.0.0.1:1080")
	tr := &http.Transport{Dial: dialSocksProxy}
	httpClient := &http.Client{Transport: tr}

	req, _ := http.NewRequest("GET", "http://google.com", nil)
	res, err := httpClient.Do(req)
	if err != nil {
		fmt.Printf("Error: %s\n", err)
		return
	}
	defer res.Body.Close()
	contents, err := ioutil.ReadAll(res.Body)
	if err != nil {
		fmt.Printf("Error: %s\n", err)
		return
	}
	fmt.Printf("result: %s\n", contents)
}
# 別ターミナルでSOCKSつくっとく
ssh YOUR_SERVER -D 1080
# 動かす
go run example.go

社内ツールなどはSOCKS経由でアクセスできると色々楽だったりするので、組み込んでおくと捗るかもしれません。

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