I guess you formulated your URL based on what’s used in the UI? If so, bravo; that’s a great start. And you can go further by consulting the Web API link in the SonarQube page footer to see the onboard documentation for the web services.
Since I’m somewhat familiar with those docs, I’m aware that some of the keys in your query string describe which fields and which metadata to return. So in a quick experiment, I chopped out everything between &ps=200 and &languages=java and got a lot more data than before.