func httpPost() {
    resp, err := http.Post("https://www.abcd123.top/api/v1/login",
        "application/x-www-form-urlencoded",
        strings.NewReader("username=test&password=ab123123"))
    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))
}
 
func httpPostForm() {
    resp, err := http.PostForm("https://www.denlery.top/api/v1/login",
        url.Values{"username": {"auto"}, "password": {"auto123123"}})
    if err != nil {
        // handle error
    }
    defer resp.Body.Close()
    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        // handle error
    }
    fmt.Println(string(body))
 
}
 
func httpPostJson() {
    jsonStr :=[]byte(`{ "username": "auto", "password": "auto123123" }`)
    url:= "https://www.denlery.top/api/v1/login"
    req, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonStr))
    req.Header.Set("Content-Type", "application/json")
 
    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        // handle error
    }
    defer resp.Body.Close()
 
    statuscode := resp.StatusCode
    hea := resp.Header
    body, _ := ioutil.ReadAll(resp.Body)
    fmt.Println(string(body))
    fmt.Println(statuscode)
    fmt.Println(hea)
 
}

package main
 
import "fmt"
 
func sum(a, b int) {
    c := a + b
    fmt.Println("sum:" , c)
}
 
func f(a, b int) {
    defer sum(a, b)
 
    fmt.Printf("a: %d, b: %d\n", a, b)
}
 
func main() {
    a, b := 1, 2
    f(a, b)
}