Cache keys not unique

[conmar5]

The cache keys do not appear to be unique. The keys are constructed from req.params.host and req.params.id however the key will be identical for each query.

// Make key for the cached tile layer
    const key = Utils.getTileSetKey(req.params.host, req.params.id)

However req.params is like so host is not included is undefined and id will be the same for all requests
req.params { id: 'public.tablename', z: '14', x: '7832', y: '5307' }

, resulting in key 'public.tablename' rather than a key for each table and zxy parameter combination

This results in a single cache item for the first request made which then gets called for all other requests.