SACK is disabled by default and needs to be manually enabled. It not only improves performance, but also fixes hangs downloading files from certain websites. PiperOrigin-RevId: 207906742 Change-Id: I4fb7277b67bfdf83ac8195f1b9c38265a0d51e8b
PiperOrigin-RevId: 194583126 Change-Id: Ica1d8821a90f74e7e745962d71801c598c652463