Changes to Get client

added the non-success response with the status 406

media type application/json was changed to a more specific media type application/vnd.api+json for the response status 200

media type application/json was changed to a more specific media type application/vnd.api+json for the response status 401

media type application/json was changed to a more specific media type application/vnd.api+json for the response status 403

media type application/json was changed to a more specific media type application/vnd.api+json for the response status 404