[MapProxy] Different source depending on zoom level

[Pasithee Jupiter]

Hi guys

Is it possible that MapProxy sources and caches WMS images based on the map
zoom (resolution) automatically?

what I want is that MapProxy requests a WMS-Server for the first half zoom
levels and for the remaining zoom levels another WMS-Server.
First: is that possible?
Second: Do I have to do it with max_res, min_res / max_scale, min_scale
Third: If yes, could you provide a short example

Thanks a lot
Pasithee
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