Github user jacksontj commented on the pull request:
https://github.com/apache/trafficserver/pull/242#issuecomment-119399795
From some chats with @SolidWallOfCode the issue he saw may have been due to
how he implemented the feature previously (at a higher layer)-- but we aren't
sure. In my local testing I'm unable to produce any issues with having the host
file return loopback addresses, but they aren't guaranteed to be exhaustive.
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