rails/rails — comment on commit 0d3333257156544feba729ba28f6874d5a30d561
File:  line 0
By jeremy:

Yes, `""` is not valid JSON. We have `application/json` content type but an invalid body.

But rather than fix that by returning an empty JSON object, which is valid but makes no sense, why no return `204 No Content` (with no `Content-Type` header)?