pub fn make_grading_request_sender(
jwt_key: Arc<JwtKey>,
) -> impl Fn(Url, &ExerciseTask, &ExerciseTaskSubmission) -> BoxFuture<'static, ModelResult<ExerciseTaskGradingResult>>
pub fn make_grading_request_sender(
jwt_key: Arc<JwtKey>,
) -> impl Fn(Url, &ExerciseTask, &ExerciseTaskSubmission) -> BoxFuture<'static, ModelResult<ExerciseTaskGradingResult>>