I've confirmed that:

1. I can't reproduce the behavior with HEAD of wiki-ai/ores by running a simple dev server (via ./utility applications.wsgi)
2. The current HEAD of wiki-ai/ores is the version of the submodule deployed in production and beta feature

So, still no sense has been made. :/

OK. So here's my hypothesis. We're only setting the Flask config for prettyprint to False. There's no circumstances under which we set it back to True. So I've made a PR that allows the config to be set back to True for any relevant request. See https://github.com/wiki-ai/ores/pull/185 I'd like to get this merged and deployed to beta for testing there.

It works! Ready for a deploy in Prod

http://ores-beta.wmflabs.org/v2/scores/enwiki/

{
  "scores": {
    "enwiki": {
      "damaging": {
        "version": "0.3.0"
      },
      "draftquality": {
        "version": "0.0.1"
      },
      "goodfaith": {
        "version": "0.3.0"
      },
      "reverted": {
        "version": "0.3.0"
      },
      "wp10": {
        "version": "0.5.0"
      }
    }
  }
}

http://ores-beta.wmflabs.org/v2/scores/enwiki/?format=json

{"scores": {"enwiki": {"damaging": {"version": "0.3.0"}, "draftquality": {"version": "0.0.1"}, "goodfaith": {"version": "0.3.0"}, "reverted": {"version": "0.3.0"}, "wp10": {"version": "0.5.0"}}}}