Previously persistence was completed disabled if you removed this
header, which is not correct for modern HTTP, where the header is
optional and all connections should persist by default regardless.
PR-URL: https://github.com/nodejs/node/pull/46331
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Minwoo Jung <nodecorelab@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ricky Zhou <0x19951125@gmail.com>
