Yes I think there is actually a bug here...when you submit the booking post if you include the header 

Accept: plain/text

then you will get automatic failure as the interface specifies:

```

@Path("bookings")
public interface BookingService {

    /**
     * Creates a new appointment from a booking request.
     *
     * @param booking the booking
     * @return the appointment reference
     */
    @POST
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces(MediaType.APPLICATION_JSON)
    Response create(Booking booking, @Context UriInfo uriInfo);```

soo we have to use 

```accept: application/json```

however you have stated it returns `plain/text`

The real issue comes in handling the response...because if I do something like :

$response = $this->decode($output,$info['content_type'],$asArray);

as you can see the response would be null ...because I the returned header will tell me its actually application/json not plain/text... but it wont decode as json and hence will be null.