SOLVED: Nginx reverse proxy issue with Safari on iPhone solved

[ThomasPGH]

Can you share the rest of your nginx config?  Redact any domain names.

I'm still in the wake of tidying up and a trial and error phase.
At the moment I split everything up in three nested config files.

I'm natively on Windows (no docker or similar). The (external) reverse proxies are on Apache with ISPConfig, which is easy because the config at https://jellyfin.org/docs/general/networking/apache is pretty much ready to be just copied in ISPConfig's "Option" tab.

The nginx config was necessary because I used Let's Encrypt's certbot to obtain certificates for the domains that directly point to the Jellyfin server's IP address. There's pre-compiled nginx binaries for Windows but no officially supported Windows binaries for Apache, hence the switch to nginx for the internal reverse proxy.