No request cookies are sent when setting src to a URL

[nsadeh]

Hello, I am using ogv.js to play .ogg files in a web application. My web application uses cookies for session-based user auth, and the audio files are gated behind an auth middleware on the server requiring request cookies.

When I define my audio element as

let audio = document.createElement('audio')
audio.src = "https://my_backend/play_file"

The file is streamed correctly (and plays on non-Safari browsers). In the network tab, I see the correct cookies in the request.

When I define my audio element as

let audio = new OGVPlayer()
audio.src = "https://my_backend/play_file"

request to the backend fails with error 403 (which is what my server returns for a request that fails auth), and in the request tab I see no cookies.