Also, I think you want an if, not a while

No, that's how you're supposed to use CGI::Fast, as a glance into the documentation would have told you. The whole point of FCGI is a persistent process.

strict/warnings would not have caught the infinite loop tho

It would?

 (Somehow I missed the "not" in that sentence, my apologies.)
Maybe nodes{ exists $nodes{$query} ? $query : '_err' }(); needs to be nodes{ exists $nodes{$query} ? $query : '_err' }->();

No.

hippo's answer is correct: The problem is there are two CGI objects in the program.

In reply to Re^2: Getting query string with CGI::Fast by haukex
in thread Getting query string with CGI::Fast by Anonymous Monk

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