Please see the api docs, this does not work with HTML, you need something like
GML as the output format for GetFeatureInfo.
/**
* APIProperty: drillDown
* {Boolean} Drill down over all WMS layers in the map. When
* using drillDown mode, hover is not possible, and an infoFormat that
* returns parseable features is required. Default is false.
*/
Using infoFormat:"application/vnd.ogc.gml" changes anything.
With drillDown and layers=null I can see 4 request to my proxy but the most
frequent popup is on comuni and province layers.
giving layers declaration as, for example: layers: [invasi, corine]
This strategy blocks the getfeatureinfo event on click, in other words it
doesn't fires at all.
I'm investigating on this and need help,
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