If you add 
$c->send_response($response);
$c->force_last_request;

[download]
or force HTTP version less than 1.1, then the server won't try to use HTTP persistent connection.

It appears the OS is allowing perl and firefox to share a socket to localhost:4242, and then firefox is blocking access until you exit. I'm not sure if the OS is doing the right thing here.

In reply to Re^2: Strange blocking issue with HTTP::Daemon by Anonymous Monk
in thread Strange blocking issue with HTTP::Daemon by isync

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