The reverse proxy handles https. The proxy will communicate internally to jellyfin via http. You CAN have the proxy communicate via https to jellyfin, but that adds unnecessary overhead.
Jellyfin 10.10.1 (Docker)
Ubuntu 24.04 LTS
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
3x WD Red Pro 6TB CMR in RAIDZ1 (JF Library)