I ran across a new “your computer can’t do that” lie today.
Suppose you have a site example.com, and a subdomain dev.example.com. The dev site is just a clone of the main one, but you can make changes and test things before deploying to your live site. You might want to tell all robots to leave your dev site alone, and for good reason. The dev site could trigger Google’s duplicate content filters, or if not, Google might decide to show dev.example.com pages in it’s search results, resulting in visitors seeing things they shouldn’t.
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