Unirest in Java: Simplified, lightweight HTTP client library.
Eclipse Jetty - Web Container & Clients - supports HTTP/2, HTTP/1.1, HTTP/1.0, websocket, servlets, and more
An HTTP client for Android, Kotlin, and Java.
Type-safe HTTP client for Android and Java by Square, Inc.
a curl-inspired but java based http command line client
http-kit is a minimalist, event-driven, high-performance Clojure HTTP server/client library with WebSocket and asynchronous support
Java HTTP Request Library
The Grizzly Async Http Client (GAHC) library purpose is to allow Java applications to easily execute HTTP requests and asynchronously process the HTTP responses