Nice idea, but some hipster developer at a company we query decided it would be A Good Idea (TM) to switch from using DNS to query their data to a REST API over

Nice idea, but some hipster developer at a company we query decided it would be A Good Idea (TM) to switch from using DNS to query their data to a REST API over HTTPS that returns JSON. Normally, this would be a "whatever" type thing, but see, the code I work on is in a critical, real-time path (as a phone call is being made). We were promised that Java client code would be provided, but see, we don't use Java. Sigh.