Commits on Dec 14, 2020

1. Fix RT #81381 - Make LWP::UserAgent robust to 5.17.6/5.18 hash random… …

   …ization
   
   Audited and fixed any potential hash order dependency bugs in
   LWP::UserAgent. I replaced all the uses of each() with keys() to avoid
   hash iterator state bugs, and made sure that keys are sorted where
   their order might matter, which was as far as I could tell only in
   how proxy configuration was read from the envrionment.
   
   There was ambiguity as to which of $ENV{http_proxy} and
   $ENV{HTTP_PROXY} would be chosen by LWP::UserAgent->env_proxy(). We now
   choose HTTP_PROXY if both are set, and if they differ we warn about
   the conflicting configuration.
   
   This patch includes tests to check that we warn on conflicting config
   and that we correctly handle setting via either.
   
   This includes a version bump to 6.05.
   
   See also:
   
   libwww-perl RT Ticket
       https://rt.cpan.org/Ticket/Display.html?id=81381
   
   bleadperl 5.17.6 patch (queued for 5.18):
       http://perl5.git.perl.org/perl.git/commit/7dc8663964c66a698d31bbdc8e8abed69bddeec3
   
   Eliminating the "rehash" mechanism for 5.18
       http://www.nntp.perl.org/group/perl.perl5.porters/2012/10/msg194813.html
   
   Switch perl's hash function to MurmurHash-32 (v3) and hash randomization by default.
       http://www.nntp.perl.org/group/perl.perl5.porters/2012/11/msg195492.html

   

   demerphq authored and oalders committed Dec 14, 2020
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