golang proxy with unix domain socket

proxy.go

package main

import (
	"crypto/tls"
	"fmt"
	"golang.org/x/net/proxy"
	"io/ioutil"
	"net"
	"net/http"
	"os"
	"time"
)

const targetURL = "http://x.y.z/a/b/c"

func GetHttpClient() *http.Client{
	return &http.Client{
		Timeout: 90 * time.Second,
		Transport: &http.Transport{
			Proxy: http.ProxyFromEnvironment,
			DialContext: (&net.Dialer{
				Timeout:   30 * time.Second,
				KeepAlive: 60 * time.Second,
				DualStack: true,
			}).DialContext,
			MaxIdleConns:          100,
			IdleConnTimeout:       180 * time.Second,
			TLSHandshakeTimeout:   10 * time.Second,
			ExpectContinueTimeout: 1 * time.Second,
			TLSClientConfig:       &tls.Config{InsecureSkipVerify: true},
		},
	}
}

func showOutput(resp *http.Response, err error){
	if err != nil{
		fmt.Printf("error: %q", err)
	}else{
		defer resp.Body.Close()
		content, _ := ioutil.ReadAll(resp.Body)
		fmt.Printf("content: %s", string(content))
	}
}

func socksProxyHttpClient(network, address string) *http.Client{
	dialer, err := proxy.SOCKS5(network, address, nil, proxy.Direct)
	if err != nil{
		fmt.Printf("failed to connect to")
		os.Exit(1)
	}
	ht := &http.Transport{}
	client := &http.Client{Transport: ht}
	ht.Dial = dialer.Dial
	return client
}

func main(){
	fmt.Println("-----> 1.direct request")
	showOutput(GetHttpClient().Get(targetURL))

	fmt.Println("\n-----> 2.socks5 proxy with ip+port")
	showOutput(socksProxyHttpClient("tcp", "localhost:17777").Get(targetURL))

	fmt.Println("\n-----> 3.socks5 proxy with unix domain socket")
	showOutput(socksProxyHttpClient("unix", "./dynamic_port.proxy").Get(targetURL))
}