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by diocles 1259 days ago
(Not the parent but) one cool CGI-specific problem that always comes to mind is HTTPoxy:

https://www.ionos.co.uk/digitalguide/server/configuration/ht...

You could write this off as a library implementation problem, but it comes about because of unfortunate mapping of HTTP parameters to well-known environment variables in CGI, and has tripped up multiple library authors.