Function warp::filters::sse::last_event_id

pub fn last_event_id<T>(
) -> impl Filter<Extract = (Option<T>,), Error = Rejection> + Copy where
    T: FromStr + Send + Sync + 'static, 

Gets the optional last event id from request. Typically this identifier represented as number or string.

let app = warp::sse::last_event_id::<u32>();

// The identifier is present
async {
    assert_eq!(
        warp::test::request()
           .header("Last-Event-ID", "12")
           .filter(&app)
           .await
           .unwrap(),
        Some(12)
    );

    // The identifier is missing
    assert_eq!(
       warp::test::request()
           .filter(&app)
           .await
           .unwrap(),
        None
    );

    // The identifier is not a valid
    assert!(
       warp::test::request()
           .header("Last-Event-ID", "abc")
           .filter(&app)
           .await
           .is_err(),
    );
};