get moz-extension scheme file throws ClientException: Invalid content-length header [-1]

[Chralu]

Getting a file from a firefox extension, returns Content-length is -1.

Because of this, get method throws a ClientException: Invalid content-length header [-1]. exception.

await get('moz-extension://<extension-id>/index.html')

Should that check be disabled for moz-extension scheme ?

http version : 1.2.1