title: api gateway regional custom domain is not working
body: <p>I'm testing to make mobile game server with AWS's Lambda and API gateway.
  At the API gateway, I try to make custom domain using 2 types endpoint, regional <code>a.domain.com</code> and edge optimized <code>b.domain.com</code>. The edge optimized endpoint is fine, it works. </p>
  
  <p>But the regional endpoint is not working. it returns ERR_CONNECTION_REFUSED.
  the regional endpoint url can't submit to record set using aws console. </p>
  
  <p>So I'm using aws-cli for editing record set in the route53.</p>