: If both the main domain name and the subdomain of heroku.com have the exact same content, Google is going to treat them as duplicates. It is probably going to pick one or the other for
If both the main domain name and the subdomain of heroku.com have the exact same content, Google is going to treat them as duplicates. It is probably going to pick one or the other for inclusion into the search index and not index the other.
If both are powered by the same code base, you may have trouble getting robots.txt to work. You would need to show different content in robots.txt for the two different domains.
The easiest solution is to add a link rel canonical tag to the head of every page that says where you would like Google to view the page:
<link rel="canonical" href="http://www.luminoto.com/page.html" />
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