Golang 標准庫構建 http.Requests 請求

Get 請求

package main
import (
    "fmt"
    "io/ioutil"
    "net/http"
)

func main() {
    response, err := http.Get("http://www.baidu.com")
    if err != nil {
    // handle error
    }
    //程序在使用完回復后必須關閉回復的主體。
    defer response.Body.Close()

    body, _ := ioutil.ReadAll(response.Body)
    fmt.Println(string(body))
}

// Golang HTTP GET 添加請求參數
func GetAddQuery(){
    req, err := http.NewRequest("GET", "http://api.themoviedb.org/3/tv/popular", nil)
    if err != nil {
        log.Print(err)
        os.Exit(1)
    }
    q := req.URL.Query()
    q.Add("api_key", "key_from_environment_or_flag")
    q.Add("another_thing", "foo & bar")
    req.URL.RawQuery = q.Encode()

    fmt.Println(req.URL.String())
    // Output:
    // http://api.themoviedb.org/3/tv/popular?another_thing=foo+%26+bar&api_key=key_from_environment_or_flag
    var resp *http.Response
    resp, err = http.DefaultClient.Do(req)
    if err != nil {
        log.Print(err)
    }
    defer resp.Body.Close()
}

POST 請求

package main

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

func main() {
    body := "{\"action\":20}"
    res, err := http.Post("http://xxx.com", "application/json;charset=utf-8", bytes.NewBuffer([]byte(body)))
    if err != nil {
        fmt.Println("Fatal error ", err.Error())
    }

    defer res.Body.Close()

    content, err := ioutil.ReadAll(res.Body)
    if err != nil {
        fmt.Println("Fatal error ", err.Error())
    }

    fmt.Println(string(content))
}

http.Client和http.NewRequest來模擬請求

package main
import (
    "fmt"
    "io/ioutil"
    "net/http"
    "net/url"
    "strings"
)

func main() {
    v := url.Values{}
    v.Set("username", "xxxx")
    v.Set("password", "xxxx")
    //利用指定的method,url以及可選的body返回一個新的請求.如果body參數實現了io.Closer接口，Request返回值的Body 字段會被設置為body，並會被Client類型的Do、Post和PostFOrm方法以及Transport.RoundTrip方法關閉。
    body := ioutil.NopCloser(strings.NewReader(v.Encode())) //把form數據編下碼
    client := &http.Client{}//客戶端,被Get,Head以及Post使用
    reqest, err := http.NewRequest("POST", "http://xxx.com/logindo", body)
    if err != nil {
        fmt.Println("Fatal error ", err.Error())
    }
    //給一個key設定為響應的value.
    reqest.Header.Set("Content-Type", "application/x-www-form-urlencoded;param=value") //必須設定該參數,POST參數才能正常提交

    resp, err := client.Do(reqest)//發送請求
    defer resp.Body.Close()//一定要關閉resp.Body
    content, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        fmt.Println("Fatal error ", err.Error())
    }

    fmt.Println(string(content))
}

復雜請求，頭參數，cookie 之類

func httpDo() {
    client := &http.Client{}
 
    req, err := http.NewRequest("POST", "http://www.01happy.com/demo/accept.php", strings.NewReader("name=cjb"))
    if err != nil {
        // handle error
    }
 
    req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
    req.Header.Set("Cookie", "name=anny")
 
    resp, err := client.Do(req)
 
    defer resp.Body.Close()
 
    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        // handle error
    }
 
    fmt.Println(string(body))
}