[curl/curl] fab6d7: hostip: make 'localhost' return fixed values

  Branch: refs/heads/bagder/fixed-localhost
  Home:   https://github.com/curl/curl
  Commit: fab6d74049e6f445518835de984ccb2bd8cd4eed
      https://github.com/curl/curl/commit/fab6d74049e6f445518835de984ccb2bd8cd4eed
  Author: Daniel Stenberg <[email protected]>
  Date:   2021-05-11 (Tue, 11 May 2021)

  Changed paths:
    M lib/hostip.c

  Log Message:
  -----------
  hostip: make 'localhost' return fixed values

Resolving the case insensitive host name 'localhost' now returns the
addresses 127.0.0.1 and (if IPv6 is enabled) ::1 without using any
resolver.

This removes the risk that users accidentally resolves 'localhost' to
something else. By making sure 'localhost' is always local, we can
assume a "secure context" for such transfers (for cookies etc).


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