go http 请求

比较简单的方式有两个:(下面的代码是抄的)
1.http.post()/http.get()

func httpPost() {
    resp, err := http.Post("http://www.01happy.com/demo/accept.php",
        "application/x-www-form-urlencoded",
        strings.NewReader("name=cjb"))
    if err != nil {
        fmt.Println(err)
    }

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

    fmt.Println(string(body))
}

2.http.Client.DO()

func httpDo() {
    client := &http.Client{}

    req, err := http.NewRequest("POST", "http://www.01happy.com/demo/accept.php", strings.NewReader("name=cjb")) //bytes.NewReader()
    if err != nil {
        // handle error
    }

    req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
    req.Header.Set("Cookie", "name=anny")

    resp, err := client.Do(req)

    defer resp.Body.Close()

    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        // handle error
    }

    fmt.Println(string(body))
}

3.net url

参考 ：https://blog.csdn.net/typ2004/article/details/38669949

        u, _ := url.Parse("http://localhost:9001/xiaoyue")  
        q := u.Query()  
        q.Set("username", "user")  
        q.Set("password", "passwd")  
        u.RawQuery = q.Encode()  
        res, err := http.Get(u.String());  

4.不确定返回body的数据时如何解析

例子和3一样是出自：https://blog.csdn.net/typ2004/article/details/38669949

result, _:= ioutil.ReadAll(r.Body)  
r.Body.Close()  
fmt.Printf("%s\n", result)  

//未知类型的推荐处理方法  

var f interface{}  
json.Unmarshal(result, &f)   
m := f.(map[string]interface{})  
for k, v := range m {  
    switch vv := v.(type) {  
        case string:  
            fmt.Println(k, "is string", vv)  
        case int:  
            fmt.Println(k, "is int", vv)  
        case float64:  
            fmt.Println(k,"is float64",vv)  
        case []interface{}:  
            fmt.Println(k, "is an array:")  
            for i, u := range vv {  
                fmt.Println(i, u)  
            }  
        default:  
            fmt.Println(k, "is of a type I don't know how to handle")   
    }  
}  

参考：
这两篇都不太好，不过例子可以跑通。
https://www.cnblogs.com/mafeng/p/7068837.html
https://studygolang.com/articles/4830