The problem is that the my $handle variable is private to the callback sub, and is not referenced anywhere else. So when that sub returns (immediately after push_writing your "Hello" message), it will be destroyed, and with it, your connection.
A solution is including a reference to it in one of AE::Handle's callbacks, e.g.:
on_error => sub {
my ($hdl, $fatal, $msg) = @_;
AE::log error => $msg;
$hdl->destroy();
undef $handle; # <------
},
This way, the callback sub closes over the variable, so its reference count will be nonzero when the sub returns and thus your connection will stay alive.
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