/usr/share/perl5/HTTP/Proxy/ is in libhttp-proxy-perl 0.301-1+deb8u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/perl5/HTTP/Proxy/BodyFilter/
/usr/share/perl5/HTTP/Proxy/BodyFilter.pm
/usr/share/perl5/HTTP/Proxy/BodyFilter/complete.pm
/usr/share/perl5/HTTP/Proxy/BodyFilter/htmlparser.pm
/usr/share/perl5/HTTP/Proxy/BodyFilter/htmltext.pm
/usr/share/perl5/HTTP/Proxy/BodyFilter/lines.pm
/usr/share/perl5/HTTP/Proxy/BodyFilter/save.pm
/usr/share/perl5/HTTP/Proxy/BodyFilter/simple.pm
/usr/share/perl5/HTTP/Proxy/BodyFilter/tags.pm
/usr/share/perl5/HTTP/Proxy/Engine/
/usr/share/perl5/HTTP/Proxy/Engine.pm
/usr/share/perl5/HTTP/Proxy/Engine/Legacy.pm
/usr/share/perl5/HTTP/Proxy/Engine/NoFork.pm
/usr/share/perl5/HTTP/Proxy/Engine/ScoreBoard.pm
/usr/share/perl5/HTTP/Proxy/Engine/Threaded.pm
/usr/share/perl5/HTTP/Proxy/FilterStack.pm
/usr/share/perl5/HTTP/Proxy/HeaderFilter/
/usr/share/perl5/HTTP/Proxy/HeaderFilter.pm
/usr/share/perl5/HTTP/Proxy/HeaderFilter/simple.pm
/usr/share/perl5/HTTP/Proxy/HeaderFilter/standard.pm