I ran OpenSpeedTest from my PC to my Raspberry Pi 4B, both connected via LAN to my WiFi router. The left screenshot shows the speedtest via local_ip:3000, and I'm getting the expected 1 Gbps up/down.
The right screenshot shows the speedtest via https://speed.mydomain.com/. I'm confident that the connection from my PC to my home server is routed internally and not through the internet because my lowest ping to the nearest Speedtest server (my own ISP) on speedtest.net is 6ms, and my internet speed is 100 Mbps up/down. So the traffic must be routing internally.
Is there typically such a massive difference between using http://local_ip:3000 and https://speed.mydomain.com/?
Additional context: The speedtest server is running via Docker Compose. I'm using Nginx (native, not Docker) to access these services from outside my network.
Looking at openspeedtests github page, this immediately sticks out to me:
/edit;
Decided to spin up this container and play with it a bit myself.
I just used my standard nginx proxy config which enables websockets and https, but I didn't explicitly set the max_body_size like their example does. I don't really notice a difference in speed, switching between the proxy and a direct connection.
So, That may be a bit of a red herring.
Also, proxy_buffering