Get signing alg from JWT header

[vgnshiyer]

It would be nice to get the signing algorithm from the JWT header.

def get_signing_alg_from_jwt(self, token: str) -> str:
        unverified = decode_token(token, options={"verify_signature": False})
        header = unverified["header"]
        return header.get("alg", None)

[bramswenson]

You can use jwt.api_jwt.decode_complete to get the complete message.