Function xyz_tile

pub async fn xyz_tile<'a>(
    app_cache: &State<Cache>,
    etag_if_none_match: EtagIfNoneMatch<'_>,
    alias: &str,
    a: &str,
    x: &str,
    y: &str,
    z: &str,
) -> Option<CachedFile>

URL for XYZ tile.