this is right URL which is call to get direction path between two geo point.
http://maps.googleapis.com/maps/api/directions/json?origin=23%C2%B0%201%27%2050.49711640%22%2C%2072%C2%B0%2034%27%2014.520786762%22&destination=22%C2%B0%2017%27%208.23132830%22%2C%2073%C2%B0%2012%27%2026.766651630%22&sensor=true&mode=driving
there is no need to pass KEY=api-key
in Direction URL..
so,please remove this paramter.and call URL As per above..
api key only put in <meta-data>
tag in manifest file.
Please call this URL:
https://maps.googleapis.com/maps/api/directions/json?origin=Toronto&destination=Montreal&sensor=false
i hope its useful to you.