What the HTTP Client API is
How to create HTTP clients
How to make HTTP requests
How to receive and process HTTP responses
How to push unsolicited data from server to client using server push
How to use HTTP basic authentication to authenticate access to resources on the server
How to create WebSocket client endpoints
JDK 9 and 10 delivered the HTTP Client API as an incubator module. JDK 11 included it as a standard module named java.net.http. The types are in the java.net.http package.