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A comment on Show HN: A url-based API for images (my weekend project). Parent comment

Re:Show HN: A url-based API for images (my weekend project) by imechura on Sunday April 28, 2013 @09:04PM (#5623568)
In this case optimus_prime is a sub domain. The actual DNS entry is likely *.jpg.to so DNS does not have to know how to resolve the URI section with underscore.
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Re:Show HN: A url-based API for images (my weekend project) by TazeTSchnitzel on Monday April 29, 2013 @12:06PM (#5627011)
I'm not sure wildcard entries are actually a feature of DNS, I thought they were something done server-side by the DNS server.
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