v17 fails to include response payload in POST requests

[hueniverse]

The combination of an incoming HTTP POST request and the changes to node's close event make this case look like the request failed to transmit. The solution is to refactor the code per version 18 and newer, but for v17, just going to patch it so it passes the information. It may cause failed requests (closed early) to show as transmitted (request.response) will be present, but that's acceptable side effect.