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In production should I just be using the Apache client?

Is there one you'd recommend? Binary size isn't a concern and we don't really need any real features.

I personally default to OkHttp, but for no particular reason. They're all solid performers. I'd probably choose Jetty last because I've never used it in prod personally.

OkHttp also has an easy way to configure listeners so you can measure things like DNS lookup latency, which is pretty niche, but useful

I've been using OkHTTP for requests, but our the server mostly just talks to a database and server as an HTTP end point.

BTW, you can test the entire thing without using an HTTP client - because of the symmetric interface you can just replace the OkHttp() interface with your app and test completely in-memory