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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.371 by root, Wed Aug 24 23:59:10 2011 UTC vs.
Revision 1.372 by root, Thu Aug 25 01:29:11 2011 UTC

… …
2136but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4> 2136but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4>
2137- only support IPv4, never try to resolve or contact IPv6 2137- only support IPv4, never try to resolve or contact IPv6
2138addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or 2138addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or
2139IPv6, but prefer IPv6 over IPv4. 2139IPv6, but prefer IPv6 over IPv4.
2140 2140
2141=item C<PERL_ANYEVENT_HOSTS>
2142
2143This variable, if specified, overrides the F</etc/hosts> file used by
2144L<AnyEvent::Socket>C<::resolve_sockaddr>, i.e. hosts aliases will be read
2145from that file instead.
2146
2141=item C<PERL_ANYEVENT_EDNS0> 2147=item C<PERL_ANYEVENT_EDNS0>
2142 2148
2143Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension for 2149Used by L<AnyEvent::DNS> to decide whether to use the EDNS0 extension for
2144DNS. This extension is generally useful to reduce DNS traffic, especially 2150DNS. This extension is generally useful to reduce DNS traffic, especially
2145when DNSSEC is involved, but some (broken) firewalls drop such DNS 2151when DNSSEC is involved, but some (broken) firewalls drop such DNS

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