... $mech->proxy(['https', 'http', 'ftp'], 'my_proxy:8080'); much better than $ENV{HTTPS_PROXY} = 'my_proxy:8080';

You are correct in theory :)  In practice, though, I think it's a known problem that LWP's proxy method doesn't work with HTTPS (see the yellow box on the right on the page linked to). This has come up a couple of times (here at PM, and elsewhere), and the workaround has so far typically been to use Crypt::SSLeay in combination with the HTTPS_PROXY env var. So, unless the issue has been fixed in the meantime (which I don't think it has), it's always a good default strategy to try what has worked for others...  Hopefully, the OP will report back with what worked in this case.

In reply to Re^2: WWW::Mechanize with https and a proxy by almut
in thread WWW::Mechanize with https and a proxy by justinm1

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