Request hang when https connection is silently closed

[quinnj]

Observed in a production setting that a very long request (> 10 minutes) seemed to hang when the connection was silently closed from the remote side. Passing keepalive=true fixed the issue, but not sure why the request didn't throw an error instead of hang. Need to figure out if the underlying socket was closed or not, or if the ssl layer didn't properly process the close-notify or something?