Some background can be found for pmdevs on Automatic redirection with https://perlmonks.org/?node=http://spammer.com

The relevant part is:

I was curious how many spammers actually succeeded to post porn links in the monastery, so I ran a site search on google

porn site:perlmonks.org

to my big surprise I got plenty of hits from spammers using an automatic redirection from PM to their sites

What's happening is that links of the form

https://perlmonks.org/?node=http://spammer.com

are automatically redirected.

and that's what the searchbox basically does, it puts any searchterm after the ?node= and then our scheme://queries (including http:// ) were translated.

That's why the gods decided to disable this feature, any link-format will now only be searched verbatim.

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