golang如何用http.NewRequest创建get和post请求

package main

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

func main() {
 // 创建GET请求
 getRequest, err := http.NewRequest("GET", "https://api.example.com/data", nil)
 if err != nil {
 fmt.Println("创建GET请求失败:", err)
 return
 }

 // 发送GET请求并获取响应
 client := &http.Client{}
 getResponse, err := client.Do(getRequest)
 if err != nil {
 fmt.Println("发送GET请求失败:", err)
 return
 }
 defer getResponse.Body.Close()

 // 读取GET响应的内容
 getResponseBody, err := ioutil.ReadAll(getResponse.Body)
 if err != nil {
 fmt.Println("读取GET响应失败:", err)
 return
 }

 // 打印GET响应的内容
 fmt.Println(string(getResponseBody))

 // 创建POST请求
 postData := []byte(`{"key1": "value1", "key2": "value2"}`)
 postRequest, err := http.NewRequest("POST", "https://api.example.com/data", bytes.NewBuffer(postData))
 if err != nil {
 fmt.Println("创建POST请求失败:", err)
 return
 }
 postRequest.Header.Set("Content-Type", "application/json") // 设置请求头，指定内容类型为JSON

 // 发送POST请求并获取响应
 postResponse, err := client.Do(postRequest)
 if err != nil {
 fmt.Println("发送POST请求失败:", err)
 return
 }
 defer postResponse.Body.Close()

 // 读取POST响应的内容
 postResponseBody, err := ioutil.ReadAll(postResponse.Body)
 if err != nil {
 fmt.Println("读取POST响应失败:", err)
 return
 }

 // 打印POST响应的内容
 fmt.Println(string(postResponseBody))
}

req, err := http.NewRequest("Post", url, bytes.NewBuffer(data))