Type-safe HTTP client for Android and Java by Square, Inc.
Square’s meticulous HTTP client for Java and Kotlin.
Feign makes writing java http clients easier
Eclipse Jetty - Web Container & Clients - supports HTTP/2, HTTP/1.1, HTTP/1.0, websocket, servlets, and more
Unirest in Java: Simplified, lightweight HTTP client library.
Java HTTP Request Library
A Java HTTP client for consuming Twitter's realtime Streaming API
http-kit is a minimalist, event-driven, high-performance Clojure HTTP server/client library with WebSocket and asynchronous support
Convenient http client for java, inspired by python request module