heroku怎么知道你是不是买了这个域名？

Question

I am trying to use a custom domain name in Heroku. So I was following the general directions and I had a question about it.

So I want to get rid of the herokuapp.com in example.herokuapp.com, which requires that I buy the example.com domain name.

It says in the first step "Confirm that you own the custom domain name. If not, you can buy one with a domain registration service."

How does heroku know that I bought example.com in the domain registration service?

Answer 1

If you look at your Herokuapp.com dashboard, for your particular app, you'll find that heroku has issued you a specific domain name. Something like some-custom-string.herokudns.com . Notice that this is herokuDNS.com which is different from herokuapp.com (herokuapp.com is used to access your website publicly). Only you have access to this custom dns string.

When you buy a domain name from a registrar, it'll usually also provide a DNS server. You'll then add a CNAME record in your DNS settings to point to your heroku provided some-custom-string.herokudns.com url. Since only you've access to your DNS server settings, if Heroku finds that the cname entry is present in your DNS records, it'll be a confirmation that you own the domain. The steps to do this are described here .