Sometimes, this URL will return a 403 error, with the error message
"This is not a valid key. Please check that you have entered this correctly. If you do not have a key, you can obtain a free key by registering at http://developer.mapquest.com."
And sometimes it will return results, as expected.
I tested by manually using curl on the command line, and twice I received that error, and the third time, I received a statusCode = 0, with the expected response.
The two requests that failed (HTTP header from response):
Date: Wed, 02 Sep 2015 14:47:25 GMT
Date: Wed, 02 Sep 2015 14:47:28 GMT
And the request that succeeded had:
Date: Wed, 02 Sep 2015 14:47:29 GMT
Could someone look into this?