golang NewRequest / gorequest實現http請求

通過go語言實現http請求

http.NewRequest

客戶端：

import (
	"net/http"
	"json"
	"ioutil"
)
type Student struct{
	id string
	name string
}

type StudentReq struct{
	id string
	name string
}
func main() {
	stu := Student{
		id:"2ed4tg5fe35fgty3yy6uh",
		name:"amber",
	}
	stu,err := json.Marshal(&stu)
	reader := bytes.NewReader(stu)
	request,err := http.NewRequest("POST", "http://192.168.1.12:8000/create", reader)
	request.Header.Set("Content-Type", "application/json")
	client:=&http.Client{}
	response,err := client.Do(request)
	defer response.Body.Close()
	body,err := ioutil.ReadAll(response.Body)
	fmt.Printf(string(body))
	
	var stuReq StudentReq 
	err = json.UnMarshal(body, &stuReq)
	fmt.Println(json.MarshalIndent(stuReq))
}

解析：

1. stu,err := json.Marshal(&stu)：將stu對象改爲json格式
2. reader := bytes.NewReader(stu)：所以將json改爲byte格式，作爲body傳給http請求
3. request,err := http.NewRequest(“POST”, “http://192.168.1.12:8000/create”, reader)：創建url
4. response,err := client.Do(request)：客戶端發起請求，接收返回值
5. body,err := ioutil.ReadAll(response.Body)：讀取body的值，類型是byte
6. json.MarshalIndent(stuReq)：修改json爲標準格式

注意（坑）：
1、header裏的參數是Content-Type，不要寫成ContentType
2、【go http: read on closed response body 】如果發送的請求是分爲2個func寫的，記住defer要在ioutil.ReadAll之後執行，否則報錯

gorequest

這種方式適合在url裏拼接參數使用param直接傳遞

"github.com/parnurzeal/gorequest"

func main() {
	resp, body, errs := gorequest.New().Post("http://127.0.0.1/create").Param("ip", "192.168.1.4").EndBytes()
		if errs != nil || resp.StatusCode >= 300 {
			log.Errorf("fail to call api with errors %v, %+v", errs, body)
		}
	var stuReq StudentReq 
	err = json.UnMarshal(body, &stuReq)
	fmt.Println(json.MarshalIndent(stuReq))
}