基本使用

发送HTTP请求

• 普通的请求

	resp, err := http.Get("http://example.com/")
  ...
  resp, err := http.Post("http://example.com/upload", "image/jpeg", &buf)
  ...
  resp, err := http.PostForm("http://example.com/form",
  	url.Values{"key": {"Value"}, "id": {"123"}})

Go

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拿到响应之后需要关闭Response.Body:

	resp, err := http.Get("http://example.com/")
  if err != nil {
  	// handle error
  }
  defer resp.Body.Close()
  body, err := ioutil.ReadAll(resp.Body)
  // ...

Go

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• 自定义Header

	client := &http.Client{
  	CheckRedirect: redirectPolicyFunc,
  }
  
  req, err := http.NewRequest("GET", "http://example.com", nil)
  req.Header.Add("If-None-Match", `W/"wyzzy"`)
  resp, err := client.Do(req)

Go

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• 连接控制,比如超时时间等

	tr := &http.Transport{
  	MaxIdleConns:       10,
  	IdleConnTimeout:    30 * time.Second,
  	DisableCompression: true,
  }
  client := &http.Client{Transport: tr}
  resp, err := client.Get("https://example.com")

Go

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响应请求

• 简单响应

	http.Handle("/foo", fooHandler)
  
  http.HandleFunc("/bar", func(w http.ResponseWriter, r *http.Request) {
  	fmt.Fprintf(w, "Hello, %q", html.EscapeString(r.URL.Path))
  })
  
  log.Fatal(http.ListenAndServe(":8080", nil))

Go

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• 自定义控制响应

	s := &http.Server{
  	Addr:           ":8080",
  	Handler:        myHandler,
  	ReadTimeout:    10 * time.Second,
  	WriteTimeout:   10 * time.Second,
  	MaxHeaderBytes: 1 << 20,
  }
  log.Fatal(s.ListenAndServe())

Go

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一个简单的Demo

package main

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

func main() {
	http.HandleFunc("/", home)
	fmt.Println("url: http://localhost:8080 ")
	err := http.ListenAndServe(":8080", nil)
	if err != nil {
		log.Fatal("ListenAndServe", err)
	}
}

// 默认处理
func home(writer http.ResponseWriter, request *http.Request) {
	http.Get("https://api.github.com/users/jiangkang")
	client := &http.Client{}
	req, _ := http.NewRequest(http.MethodGet, "https://api.github.com/users/jiangkang", nil)
	req.Header.Add("Accept", "application/vnd.github.v3+json")
	response, _ := client.Do(req)
	body, _ := ioutil.ReadAll(response.Body)
	writer.Write(body)
}

处理表单数据/Query数据

func login(writer http.ResponseWriter, request *http.Request) {
	if request.Method == http.MethodGet {
		t,_ := template.ParseFiles("html/login.html")
		t.Execute(writer,nil)
	} else if request.Method == http.MethodPost {
		request.ParseForm()
		username := request.Form.Get("username")
		password := request.Form.Get("password")
		fmt.Fprintf(writer,"登陆成功：username: %s \n, password: %s",username,password)
	}
}