http error 426 Upgrade Required

[LeithMaa]

Just after installing and enabling the stream on port 4444.
Firefox showing blank page, seems like a http protocol issue (v1.1 vs v2)
a wireshark capture shows
Client :
GET /favicon.ico HTTP/1.1
Host: 127.0.0.1:4444
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:99.0) Gecko/20100101 Firefox/99.0
Accept: image/avif,image/webp,/
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Referer: http://127.0.0.1:4444/
Connection: keep-alive
Sec-Fetch-Dest: image
Sec-Fetch-Mode: no-cors
Sec-Fetch-Site: same-origin
Pragma: no-cache
Cache-Control: no-cache

Server:
HTTP/1.1 426 Upgrade Required
Server: obs/27.2.3-m99-2.27