Go语言中的HTTP client， server非常简单。具体如下。

HTTP Server

package  main

import (

        "fmt"

        "html"

        "io/ioutil"

        "log"

        "net/http"

)

func main() {

        http.HandleFunc("/bar", func (w http.ResponseWriter, r *http.Request){

                fmt.Fprintf(w, "Hello, %q", html.EscapeString(r.URL.Path))

                if r.Method == "POST" {

                        b, err := ioutil.ReadAll(r.Body)

                        if err != nil {

                                log.Println("Read failed:", err)

                        }

                        defer r.Body.Close()

                        log.Println("b:", string(b))

                } else {

                        log.Println("ONly support Post")

                        w.Write([]byte("Only support post"))

                }

        })

        log.Fatal(http.ListenAndServe(":8080", nil))

}

HTTP Client

1. GET方式

   package main
   
   import (
   
           "io/ioutil"
   
           "log"
   
           "net/http"
   
   )
   
   func main() {
   
           url := "http://127.0.0.1:8080/bar"
   
           resp, err := http.Get(url)
   
           if err != nil {
   
                   log.Println("Get failed:", err)
   
                   return
   
           }
   
           defer resp.Body.Close()
   
           if resp.StatusCode != http.StatusOK {
   
                   log.Println("statuscode:", resp.StatusCode)
   
           }
   
           content, err := ioutil.ReadAll(resp.Body)
   
           if err != nil {
   
                   log.Println("Read failed:", err)
   
           }
   
           log.Println("content:", string(content))
   
   }
   

2. POST方式

   package main
   
   import (
   
           "bytes"
   
           "io/ioutil"
   
           "log"
   
           "net/http"
   
   )
   
   func main() {
   
           url := "http://127.0.0.1:8080/bar"
   
           contentType := "application/json;charset=utf-8"
   
           b := []byte("Hello, Server")
   
           body := bytes.NewBuffer(b)
   
           resp, err := http.Post(url, contentType, body)
   
           if err != nil {
   
                   log.Println("Post failed:", err)
   
                   return
   
           }
   
           defer resp.Body.Close()
   
           content, err := ioutil.ReadAll(resp.Body)
   
           if err != nil {
   
                   log.Println("Read failed:", err)
   
                   return
   
           }
   
           log.Println("content:", string(content))
   
   }
   
   

注意：

response的Body使用后记得close，即：

resp.Body.Close()

关于如何传递json格式数据，可以参考博文go http 传递json数据