[MapProxy] WMS-C requests with "SRS=OSGEO:41001" returning "internal error"

[Jason Lee]

Hi,
I'm trying to setup a Mapproxy WMS-C service for my tiles source to be
consumed in QGIS.

The tiles source is regular XYZ tiles, same as OSM, and I can see that QGIS
requests tiles with the SRS=OSGEO:41001 which I understand is the same as
EPSG:900913.

However, once I've added the WMS-C service and clicked to add my layer, I
cannot see any map appearing. When I debug the requests coming into my
Mapproxy server I see request like this:-

http://www.myserver.com/maps/service?SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&WIDTH=256&HEIGHT=256&LAYERS=mylayer&STYLES=&FORMAT=image/png&SRS=OSGEO:41001&TILED=true&BBOX=78271.5170226730406284,6688851.4712606649845839,78577.2651358135044575,6689157.2193738073110580

...which just returns an "internal error" message in a browser.

If I replace "OSGEO:41001" with "EPSG:91001" i the above request I get a
valid map tile. I'm guessing I need to setup my MapProxy with 41001 as a
custom projection?

Any help/advice much appreciated.

Jason
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