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If an http response has an 'end' handler that throws, then the socket will never be released back into the pool. Granted, we do NOT guarantee that throwing will never have adverse effects on Node internal state. Such a guarantee cannot be reasonably made in a shared-global mutable-state side-effecty language like JavaScript. However, in this case, it's a rather trivial patch to increase our resilience a little bit, so it seems like a win. There is no semantic change in this case, except that some event listeners are removed, and the `'free'` event is emitted on nextTick, so that you can schedule another request which will re-use the same socket. From the user's point of view, there should be no detectable difference. Closes #5107