This is the new method to apply the resourcepack. It's plug-and-play, it doesn't require any setup or port forwarding.
Just disable all other hosting methods and enable simple_self_host in your config.yml, then generate the resourcepack using /iazip.
If you want you can specify your server address + port, in the server_address field, but it shouldn't be necessary.
hosting:
simple_self_host:
enabled: true
server_address: auto
optimization:
block_non_game_requests: true
max_downloads_per_ip: 5
max_speed_in_megabyte_ps: 30
