Another user already gave you the answer, but one thing to bear in mind is that Cloudflare only “speak” HTTP(S), and nothing else. So if for example you want to run Minecraft, CloudFlare’s free plan will not allow you to route it through port 80/443 as they don’t know how to “speak” the Minecraft protocol.
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Also, could a reverse proxy be used to give cloudflare’s services to a port they don’t support?
Another user already gave you the answer, but one thing to bear in mind is that Cloudflare only “speak” HTTP(S), and nothing else. So if for example you want to run Minecraft, CloudFlare’s free plan will not allow you to route it through port 80/443 as they don’t know how to “speak” the Minecraft protocol.
Yes, typically the proxy will listen on 443/80 and all the services it proxies to just use their defaults.
For example: emby.example.tld, port 443 > cloudflare, port 443 > your reverse proxy, port 443 > emby, port 8096
All the client sees is emby.example.tld on port 443 and the resulting web application, everything in between is transparent.