I'm looking the way how to use browser to query all WMS features( with all attributes the feature have) by just defining the layer parameter or what parameters I need to add to get desired result? Request all features WMS is serving, output format must be txt, gml or xml. Something like this...
wms?request=GetFeatureInfo&QUERY_LAYERS=my_layer&info_format=application/vnd.ogc.gml&select_all_features.
It's not possible, a WMS GetFeatureInfo operation fetches a point location (pixel coordinate) in a map image (created through a GetMap operation).
Also a WMS also doesn't serve out features it serves out images (or videos) that are representations of some input often, but not always, a vector data set.
What you need is for there to be a WFS (or WCS) these are 'download' services that let you get at the actual data.