Hi Jose,
I'm not completely sure what you mean. When you get a POST request in your webapp, you can respond with nothing at all, Liverpie should not crash because of that.
If that stops the call, it's possible that there's a bug in Liverpie, and you should inspect its logs. You might see this: "PROBLEM: Didn't get any response from webapp" but there's no reason why the call should hang up.