When in error state, the JsonResponse does not encapsulate the message body

[hanssens]

As posted out by @shotor, the JsonRequest does not encapsulate any messages returned by the service.

In order to reproduce, simply call the following method:

public IHttpActionResult Get() {
        return BadRequest("This message should be visible");
}

Ideally, this would be placed in the .Value property as a raw json string.

[hanssens]

In the upcoming v2.0.0 the JsonResponse is superseeded with the HttpResponseMessage. Here we have both a ReasonPhrase (string) and Content (HttpContent) property available, which should suffice.

However, this requires adding a specific test in the vnext branch to assert this behaviour. PR's for the vnext branch are appreciated for this ;)