The program does not hang (block) on the print statement, it stops at it (dies without raising an exception).
Perhaps you're getting a "broken pipe" exception. Quote from Lincoln Stein's book "Network Programming in Perl":
The PIPE signal is sent when a program writes to a pipe or socket but the process at the remote end has either exited or closed the pipe.

Try setting a $SIG{PIPE} handler to an error reporting sub.

In reply to Re(5): HTTP::Daemon aborting in send_status_line? by bart
in thread HTTP::Daemon aborting in send_status_line? by mifflin

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