I'm having an issue with the DEP simulator that is provided with the MDM protocol reference. When I try to GET the /session URI (to obtain a session token), the simulator returns an HTTP 400 Bad Request error. The logs on the simulator say that the HTTP request header is missing the 'Content-Type' header. However, the 'Content-Type' header isn't a valid request header for GET operations (and therefore it cannot be sent); it is only valid for POST/PUT operations. How do I get around this?