Check if user has access to the resource. This call behaves exactly like `GET` call, except no content is returned.

head https://qa.connect.calamp.com/connect/services/applications/{key}

This call is useful for the use case when the client only wants to check if a User has access to a specified resource, without needing the resource representation being returned as response. Results in all the same headers and HTTP response status as if a GET call had been made, without any content being returned, thus cutting down on network bandwidth and time taken for over the wire transfer.