QGIS » QGIS Application

IF a WMS service provides GetLegendGraphic url's in it's capabilities, QGIS tries to retrieve the legendimage and shows it in the layermanager.

Some services provide full url's, others only parts, that is why in current implementation there is a check IF certain query-names are available in the url-query and else are added:
https://github.com/qgis/QGIS/blob/master/src/providers/wms/qgswmsprovider.cpp#L2993

BUT certain services provide the url in lowercase key/value pairs, resulting in double key/value pairs in the url, resulting in error messages instead of images.

To test: add a layer from this service:
http://geoservices.knmi.nl/cgi-bin/RADNL_OPER_R___25PCPRR_L3.cgi?

I have already created a patch for it, and will do a pull request