On Unix, the CGI script is attached to the web server through a pipe or socket. A write to a closed pipe or socket produces a SIGPIP signale that by default kills your program. It is possible to safely cleanup by adding a signale handler. 
$SIG{PIPE} = sub { die "Pipe error"; }

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By turning the signal into a die, the error is logged and END blocks will be run.

In reply to Re: cleanup a cancelled CGI script by iburrell
in thread cleanup a cancelled CGI script by goofball

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