Puppet

This ticket is to round up a constellation of issues around data formats. A brief overview:

• The REST API doesn’t use recognizable MIME formats. (issue #4456)
• This appears to be because the network formats code takes the name of a format and prepends .to_ to it. This is bad because we end up having to ask for formats like “s,” and request “pson” instead of “json.” (see also issue #7160)
• The faces CLI uses the network formats code to render its output… except when it doesn’t. (Prettyprinted json.)
• Requesting nonexistant formats blows up in an opaque way. (issue #7269)
• Some faces, especially indirector faces, return odd default formats. (issue #7293, e.g.)

It would be nice to get to a place where users tend to get what they need by default; can expect the same formats to work on the REST API, the Faces API, and the Faces CLI; and have a sensible (text or text/plain instead of s, e.g.) set of formats that is either clearly documented or (better yet) introspectable.

Once folk feel we have more concrete tickets that capture all of what we want, we can close this ticket.