GET for nonexistent device issue

[kyork-cl]

I ran into an issue where a library I was testing would crash when issuing a GET /servers/{id}/devices/{id}/ for a device that doesn't exist. In this case, Zetta returns a 404 with the body "Device does not exist". However, the Content-Type header is still application/vnd.siren+json. The library saw the JSON content type and was automatically parsing the body which is not valid JSON.

This isn't a huge issue, but I thought I'd see what your thoughts on fixing this are.

[AdamMagaluk]

I'm up for fixing it not sure the best approach. Should we return a value JSON body with a error message? Should we change the Content-Type to text/plain? @kevinswiber Any thoughts from the Siren expert.

[kevinswiber]

As a general preference, I like structured logs. Some of the MUSTs in Siren were relaxed to account for error messages.

{
  "class": ["error", "client-error"],
  "properties": {
    "message": "Device does not exist"
  }
}

I think that should work.