I'm trying to hit a WMS server that prompts the user to choose a cert from a local smart card and authenticate with their PIN. In leaflet, every single tiled request is popping up the browser authentication dialog(s), which is unacceptable. I tried in OpenLayers and it only prompts once. I did notice that in OpenLayers, cookies were sent with each WMS request. I'll check tomorrow again with Leaflet. However, I thought I'd check here to see if anyone out there has any experience with Leaflet against such a WMS service.
Thanks in advance! I'll report tomorrow on my findings on the cookies.