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简单：

package main

import (
    "fmt"
    "io/ioutil"
    "net/http"
    "strings"
)

func main() {
    res, err := http.Get("https://www.haiyun.me/")
    if err != nil {
        return
    }
        //执行close之前一定要判断错误，如没有body会崩溃
    defer res.Body.Close()
        //重用连接一定要执行上和下两步
    body, _ := ioutil.ReadAll(res.Body)
    fmt.Println(string(body))
        fmt.Println(res.Status)
    for k, v := range res.Header {
        fmt.Println(k, strings.Join(v, ""))
    }

}

自定义client，连接读写超时及自定义head：

package main

import (
        "fmt"
        "io/ioutil"
        "net/http"
        "strings"
        "time"
)

var timeout = time.Duration(20 * time.Second)

func dialTimeout(network, addr string) (net.Conn, error) {
        return net.DialTimeout(network, addr, timeout)
}

func main() {
        tr := &http.Transport{
                //使用带超时的连接函数
                Dial: dialTimeout,
                //建立连接后读超时
                ResponseHeaderTimeout: time.Second * 2,
                //直接通过ip访问时设置sni
                TLSClientConfig: &tls.Config{
                     ServerName: "www.haiyun.me",
                },
        }
        client := &http.Client{
                Transport: tr,
                //总超时，包含连接读写
                Timeout: timeout,
        }
        req, _ := http.NewRequest("GET", "https://www.haiyun.me", nil)
        req.Header.Set("Connection", "keep-alive")
        req.Header.Set("Host", "www.haiyun.me")
        res, err := client.Do(req)
        if err != nil {
                return
        }
        defer res.Body.Close()
        body, _ := ioutil.ReadAll(res.Body)
        fmt.Println(string(body))
        for k, v := range res.Header {
                fmt.Println(k, strings.Join(v, ""))
        }

}

使用代理及指定出口IP：

        //使用HTTP PROXY
        proxyUrl, err := url.Parse("http://host:port")
        tr := &http.Transport{
                Proxy: http.ProxyURL(proxyUrl),
        }
        //指定出口IP
        ief, err := net.InterfaceByName("eth0")
        addrs, err := ief.Addrs()
        addr := &net.TCPAddr{
                IP: addrs[0].(*net.IPNet).IP,
        }
        dia := net.Dialer{LocalAddr: addr}
        tr := &http.Transport{
                Dial: dia.Dial,
        }

使用socks5代理：https://github.com/hailiang/socks
http://golang.org/pkg/net/http/#Client
http://golang.org/pkg/net/http/#Transport
http://golang.org/pkg/net/#Dialer

标签：http, go