net: make /etc/hosts lookups case-insensitive
The native Go host resolver was behaving differently than libc and the entries in the /etc/hosts were handled in a case sensitive way. In order to be compatible with libc's resolver, /etc/hosts lookups must be case-insensitive. Fixes #12806. Change-Id: I3c14001abffadf7458fd1a027c91e6438a87f285 Reviewed-on: https://go-review.googlesource.com/15321 Run-TryBot: Burcu Dogan <jbd@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Brad Fitzpatrick <bradfitz@golang.org>
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