9dbe11fa6a
Previously, this would have accepted a normal request, and returned a json response. However, if there were any errors in the request (and it is easy to introduce errors with invalid start/end times), it would result in using the fallback web error handler. Since we never want this route to handle non-json requests, it's easiest to just enforce that, so we don't have to worry about error handling for non-json requests.