golang 设置dns

package main import ( "net" "net/http" "time" ) func main() { tr := &http.Transport{ DialContext: (&net.Dialer{ Timeout: 30 * time.Second, KeepAlive: 30 * time.Second, DualStack: true, }).DialContext, MaxIdleConns: 100, IdleConnTimeout: 90 * time.Second, TLSHandshakeTimeout: 10 * time.Second, ExpectContinueTimeout: 1 * time.Second, } client := &http.Client{ Transport: tr, } // 设置DNS resolver := &net.Resolver{ PreferGo: true, Dial: func(ctx context.Context, network, address string) (net.Conn, error) { d := &net.Dialer{Timeout: 5 * time.Second} return d.DialContext(ctx, "udp", "192.168.0.1:53") }, } // 使用定制化的Dialer和Resolver tr.DialContext = func(ctx context.Context, network, addr string) (net.Conn, error) { host, port, err := net.SplitHostPort(addr) if err != nil { return nil, err } ips, err := resolver.LookupIP(ctx, network, host) if err != nil { return nil, err } return (&net.Dialer{ Timeout: 30 * time.Second, KeepAlive: 30 * time.Second, DualStack: true, }).DialContext(ctx, network, net.JoinHostPort(ips[0].String(), port)) } // 使用client发送请求 resp, err := client.Get("http://google.com") if err != nil { panic(err) } defer resp.Body.Close() fmt.Println(resp.Status) }