req.socket._hadError should be set before emitting the error event.
PR-URL: https://github.com/nodejs/node/pull/14659
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
