Set the URL of the specified overpass API. Possible APIs with global coverage are:
'http://overpass-api.de/api/interpreter' (default)
'https://overpass.kumi.systems/api/interpreter'
'http://overpass.osm.rambler.ru/cgi/interpreter'
'http://api.openstreetmap.fr/oapi/interpreter'
'https://overpass.osm.vi-di.fr/api/interpreter'
Additional APIs with limited local coverage include:
'http://overpass.osm.ch/api/interpreter' (Switzerland)
'http://overpass.openstreetmap.ie/api/interpreter' (Ireland)
set_overpass_url(overpass_url)
The desired overpass API URL
The overpass API URL
For further details, see http://wiki.openstreetmap.org/wiki/Overpass_API