Geocoding fails due to mixed content warnings

From the browser console
> Blocked loading mixed active content “http://nominatim.openstreetmap.org/search?q=123%20Main%20St&limit=5&format=json&addressdetails=1&json_callback=_l_geocoder_0”

Start by reproducing the browser-console mixed-content warning while using geocoding for the example address, then locate the code that constructs the Nominatim request. Confirm the expected geocoding flow and whether results load; done means the request no longer triggers a mixed-content warning and geocoding works in the browser.

Written by the indexing model from the issue text.