Optionalparams: URLSearchParamsSelects features based on the specified query and prepares selection parameters.
StaticbuildMapServer wants 1 filter per underlying WFS queryLayer, all included in parentheses QGIS-server wants 1 filter per underlying WFS queryLayer, each in its own in parentheses
MapServer: (
QGIS-server does not filter on a WMS layer made from multiple underlying WFS queryLayers Solution: directly query the queryLayers