訪問延遲處理 ~~~ package main import ( "fmt" "net/http" "net" "time" ) var url = []string{ "http://www.baidu.com", "http://google.com", "http://taobao.com", } func main() { for _, v := range url { //type Client struct{} c := http.Client{ //type Transport struct {} Transport: &http.Transport { //Dial func(network, addr string) (net.Conn, error) Dial:func(network, addr string) (net.Conn, error){ timeout := time.Second*2 return net.DialTimeout(network, addr, timeout) }, }, } resp, err := c.Head(v) if err != nil { fmt.Printf("head %s failed, err:%v\n", v, err) continue } fmt.Printf("head %s succ, status:%v\n", v ,resp.Status) } } ~~~ $ go run main.go 輸出結果： head http://www.baidu.com succ, status:200 OK head http://google.com failed, err:Head http://google.com: dial tcp [2404:6800:4008:801::200e]:80: i/o timeout head http://taobao.com succ, status:200 OK