Connection to azure cognitive service failed with Firefox

Question

based on Firefox 84, we have a voice-assistant app, it works fine until last Saturday（4.11）。

Azure API from https://learn.microsoft.com/en-us/azure/ai-services/speech-service/how-to-recognize-speech?pivots=programming-language-javascript

the api speechRecognizer.recognizeOnceAsync from Azure will create a web socket link with url like:

"wss://${region}.stt.speech.microsoft.com/speech/recognition/conversation/cognitiveservices/v1?language=${language}&format=detailed&Ocp-Apim-Subscription-Key=xxxxxxxxxxxxxxxxxx"

it has no response on Firefox 84,

will return 404 on Firefox 124,

return ok on Firefox 48.

works fine on Chrome