main.go

package main

import (
	"context"
	"crypto/tls"
	"fmt"
	"log"
	"net"
	"net/http"
	"os"
	"time"

	"github.com/geckoboard/goutils/net/safedialer"
)

const (
	dialTimeout = 10 * time.Second
)

func main() {
	url := os.Args[1]
	client := newHTTPClient()

	resp, err := client.Get(url)
	if err != nil {
		log.Fatalf("Request failed: %v", err)
	}
	defer resp.Body.Close()

	fmt.Printf("Response status: %s\n", resp.Status)
}

func newHTTPClient() *http.Client {
	dialer := safedialer.New("8.8.8.8:53", dialTimeout)

	// Wrap the dialer to log DNS errors
	wrappedDialer := func(ctx context.Context, network, addr string) (net.Conn, error) {
		conn, err := dialer(ctx, network, addr)
		if err != nil {
			log.Printf("Dial error: %v (network: %s, addr: %s)", err, network, addr)
		}
		return conn, err
	}

	transport := &http.Transport{
		DialContext: wrappedDialer,
		TLSClientConfig: &tls.Config{
			InsecureSkipVerify: true,
		},
		DisableKeepAlives: true,
	}

	return &http.Client{
		Transport: transport,
		Timeout:   15 * time.Second,
	}
}