check_redirect.go

package main

import (
	"flag"
	"fmt"
	"net/http"
	"os"
)

var (
	src = flag.String("url", "", "")
	dst = flag.String("d", "", "destination")
)

var redirectPolicyFunc = func(req *http.Request, via []*http.Request) error {
	return nil
}

func init() {
	flag.Parse()
}

func main() {
	client := &http.Client{
		CheckRedirect: redirectPolicyFunc,
	}

	resp, err := client.Get(*src)
	if err != nil {
		panic(err)
	}
	defer resp.Body.Close()

	u := resp.Request.URL.String()
	if u == *dst {
		fmt.Println("ok")
		os.Exit(0)
	}
	fmt.Println("ng")
	os.Exit(1)
}