Why does this JVB service need to open port 8080 instead of port 9090?

[MQPearth]

docker-jitsi-meet/docker-compose.yml

Line 433 in 02499f8

- '127.0.0.1:${JVB_COLIBRI_PORT:-8080}:8080'

When I open port 8080, it shows an error: Video Quality Impaired - The bridge Channel has been disconnect

console:

WebSocket connection to 'wss://xx.rts-test.com/colibri-ws/jvb/xxxxxxxxx/xxxxxxx?pwd=xxxxxxxxxxxx' failed: 
_initWebSocket @ BridgeChannel.js:92
t @ BridgeChannel.js:123Understand this errorAI
JingleSessionPC.js:1955 2024-12-31T06:40:06.837Z [modules/xmpp/JingleSessionPC.js] JingleSessionPC[session=JVB,initiator=false,sid=xxxxxxx] addRemoteStream - OK
BridgeChannel.js:395 2024-12-31T06:40:06.838Z [modules/RTC/BridgeChannel.js] <e.onclose>:  Channel closed: 1006 

Opening port 9090 doesn't cause this issue.

'127.0.0.1:${JVB_COLIBRI_PORT:-9090}:9090' 

I used Nginx for reverse proxy

location ~ ^/colibri-ws/jvb/(.*) {
       proxy_pass http://127.0.0.1:9090/colibri-ws/jvb/$1$is_args$args;
       proxy_http_version 1.1;
       proxy_set_header Upgrade $http_upgrade;
       proxy_set_header Connection "upgrade";
       tcp_nodelay on;
}