golang 利用http.Client POST数据

package main     import (      "fmt"      "io/ioutil"      "net/http"      "net/url"      "strings"  )     func main() {      v := url.Values{}      v.Set("huifu", "hello world")      body := ioutil.NopCloser(strings.NewReader(v.Encode())) //把form数据编下码      client := &http.Client{}      req, _ := http.NewRequest("POST", "http://192.168.2.83:8080/bingqinggongxiang/test2", body)         req.Header.Set("Content-Type", "application/x-www-form-urlencoded; param=value") //这个一定要加，不加form的值post不过去，被坑了两小时      fmt.Printf("%+v\n", req)                                                         //看下发送的结构         resp, err := client.Do(req) //发送      defer resp.Body.Close()     //一定要关闭resp.Body      data, _ := ioutil.ReadAll(resp.Body)      fmt.Println(string(data), err)  }