503 responses throw Steam::JSONError

[thomas-mcdonald]

Filing a ticket to track - happy to work on a PR for this.

The Steam API is currently down (along with the rest of Steam). The API responds with a HTML file when this happens:

Service Unavailable

The server is temporarily unable to service your request. Please try again later.
Reference #6.857ffea5.1482516293.3b52a0f

Naturally, this throws a JSON parsing error - since it's definitely not JSON:

Steam::JSONError: The API returned an unexpected JSON response

It would be nice if we could special case a 503 response and throw a Steam::UnavailableError or something similar - would be able to disambiguate between bad JSON responses (e.g. a game with no achievements returns an invalid JSON block) vs the service is down (returns 503 page).

[bhaberer]

Sounds like a good idea, thanks for the report.