[MapProxy] cascading a tile service with space in url

[LionelB]

Hello
I would like to cascade this service https://wxs.ign.fr/beta/geoportail/wmts
It works fine except for one layer/style :

https://wxs.ign.fr/beta/geoportail/wmts?service=WMTS&REQUEST=GetTile&VERSION=1.0.0&LAYER=CADASTRALPARCELS.PARCELLAIRE_EXPRESS&TILEMATRIXSET=PM&TILEMATRIX=%(z)s&TILEROW=%(y)s&TILECOL=%(x)s&FORMAT=image/png&STYLES=PCI
vecteur&
The problem is the space in STYLEs description : STYLES=PCI vecteur

Directly in
https://wxs.ign.fr/beta/geoportail/wmts?service=WMTS&REQUEST=GetTile&VERSION=1.0.0&LAYER=CADASTRALPARCELS.PARCELLAIRE_EXPRESS&TILEMATRIXSET=PM&TILEMATRIX=15&TILEROW=11464&TILECOL=16202&STYLE=PCI%20vecteur&FORMAT=image/png
works fine
But it doesn't work in my yaml config file, mapproxy crashes : TypeError:
not enough arguments for format string

I've already tried to escape space
 
\u0020
without success.

Many thanks
Lionel
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