[QGIS-Developer] QGIS Server: parameters QGIS_SERVER_CACHE_DIRECTORY and QGIS_SERVER_CACHE_SIZE

[Andreas Neumann]

Hi, 

I am trying to find out under what circumstances QGIS server uses these
two parameters: 

QGIS_SERVER_CACHE_DIRECTORY and QGIS_SERVER_CACHE_SIZE 

as described in
https://docs.qgis.org/3.10/en/docs/user_manual/working_with_ogc/server/config.html#qgis-server-cache-directory


Is this relevant when QGIS server also acts as a relay for another
network service, like loading tiles or data from another WMTS-server/WFS
server or from xyz tile sources? 

Perhaps it would be useful to add this information to the documentation?
I could do a PR if I know exactly what this cache directory is used for?


What happens in case multiple QGIS server instances would point to the
same cache directory? Would it work or be a cause for troubles? 

Thanks if you have any hints, 

Andreas
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