Support GET & POST methods together on REST procedures

Copied from BZ:

Description of request:
We can choose only one HTTP Request type for REST virtual procedures. Is it possible to combine GET & POST as one type ?

Rationale:

POST requests are more easy to create for client programmers.On the other hand GET method simplifies testing. Since it's easy to handle both request types on the server side, supporting both method at the same time may help to improve usability of services.