Loading external WFS (GML output format) in Leaflet map

I need to build a Leaflet map loading data from this external WFS service

http://wms.pcn.minambiente.it/ogc?map=/ms_ogc/wfs/Numeri_Civici_2012.map&service=WFS&request=GetCapabilities&

with these output formats

   text/xml; subtype=gml/3.1.1

Here you are a sample of the data

http://wms.pcn.minambiente.it/ogc?map=/ms_ogc/wfs/Numeri_Civici_2012.map&SERVICE=WFS&VERSION=1.0.0&REQUEST=GetFeature&TYPENAME=IN.NUMERICIVICI.2012&SRSNAME=EPSG:4326&bbox=7.59,44.83,7.75,44.94&outputFormat=GML2&

I know how to load an external WFS if the output format: here you are a sample

... but this obviously doesn't work with GML.

Any suggestions in case of GML output formats?