I am trying to consume the Google Reverse-Geocoding API using the following URL:

maps.googleapis.com/maps/api/geocode/json?latlng={Latitude},{Longitude}

Setting this URL automatically creates "Latitude" and "Longitude" parameters in my REST Action.  Pressing the TEST button after setting sample values works perfectly and returns the expected data.

However, when I try to call the REST service from my application, it returns ZERO_RESULTS.  After much confusion, I finally logged the REST call data to find the longitude parameter had been dropped from the URL.