Dns

摘自互联网 原文 package main import ( "context" "io/ioutil" "log" "net" "net/http" "time" ) func main() { var ( dnsResolverIP = "8.8.8.8:53" // Google DNS resolver. dnsResolverProto = "udp" // Protocol to use for the DNS resolver dnsResolverTimeoutMs = 5000 // Timeout (ms) for the DNS resolver (optional) ) dialer := &net.Dialer{ Resolver: &net.Resolver{ PreferGo: true, Dial: func(ctx context.Context, network, address string) (net.Conn, error) { d := net.Dialer{ Timeout: time.Duration(dnsResolverTimeoutMs) * time.Millisecond, } return d.DialContext(ctx, dnsResolverProto, dnsResolverIP) }, }, } dialContext := func(ctx context.Context, network, addr string) (net.Conn, error) { return dialer.DialContext(ctx, network, addr) } http.DefaultTransport.(*http.Transport).DialContext = dialContext httpClient := &http.Client{} // Testing the new HTTP client with the custom DNS resolver. resp, err := httpClient.Get("https://www.violetnorth.com") if err != nil { log.Fatalln(err) } defer resp.Body.Close() body, err := ioutil.ReadAll(resp.Body) if err != nil { log.Fatalln(err) } log.Println(string(body))