mp2 broken connection detection

[Malcolm J Harwood <mj...@liminalflux.net>]

The cookbook (recipe 4.9) claims that $c->aborted is only true after you've 
actually sent data to the client and flushed the buffers. For testing if the 
client is still connected, it recommends doing something like:

	$c = Apache->request->connection;
	return if ($c->aborted);
	$s = IO::Select->new($c->fileno);
	return if ($s->can_read(0));
	return 1;

Which presumably works fine with mp1, but doesn't at all with mp2.
	$c->fileno no longer exists
the closest seems to be
	$c->client_socket
but it's not obvious from the documentation how one would check that. Is it 
even needed, or does $c->aborted check whether the socket is open in mp2?



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 even in the cause of political progress".
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