Duplicate list detection

don't know if this is possible without major changes, https://winhelp2002.mvps.org/hosts.txt and http://winhelp2002.mvps.org/hosts.txt are both considered unique entries but actually result in the same file being processed twice.

possible to detect this?

PS. winhelp2002.mvps.org/hosts.txt can currently not be downloaded:

ERROR: The certificate of ‘winhelp2002.mvps.org’ is not trusted.
ERROR: The certificate of ‘winhelp2002.mvps.org’ has expired.

Already notified the contact...

As an alternative solution, why not use only one of the two URLs? You can essentially tell by inspection that these are the same file but one using TLS.

The issue is not with their certificate, it is a problem with the next level up certficate (the intermediate certificate authority) - Let's Encrypt. Their certificate expired yesterday.