pub fn filter_async_with_description<'a, Pred, Input, Output, FnArgs, Descr>(
    description: Descr,
    pred: Pred
) -> Handler<'a, Input, Output, Descr> where
    Pred: Injectable<Input, bool, FnArgs> + Send + Sync + 'a,
    Input: Send + 'a,
    Output: 'a, 
Expand description

filter_async with a custom description.