C:\Windows\System32\drivers\etc\hosts

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I have Apache installed under Vista. Today I notices that web browser does
not open URLs http://localhost/.... , but only http://127.0.0.1/...

I commented the last string of hosts file so that it now looks like this and
everything works perfectly now:

# Copyright (c) 1993-2006 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host

127.0.0.1 localhost
# ::1 localhost


Who knows what's the meaning of the last string: ::1 localhost ?
Is there any place in the world where the syntax is explained?

Thank you

http://docs.hp.com/en/B2355-90824/ch02s03.html