Plack itself doesn't handle sessions, and I don't find Plack::Session::Store::File::Mojolicious on CPAN (neither does Google find it elsewhere), so I don't know what you would need to do to make it sign the cookies using HMAC-SHA256. Maybe that file is just the Mojolicious code for cookie signing copied into the Plack API and you can also just copy the (new) Mojolicious code into that.

In reply to Re^3: Cookie not signed after upgrading mojolicious by Corion
in thread Cookie not signed after upgrading mojolicious by newperldeveloper

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