RoboSpice is a modular android library that makes writing asynchronous network requests easy

Java HTTP Request Library

A Complete Fast Android Networking Library that also supports HTTP/2

Asynchronous Http and WebSocket Client library for Java

Asynchronous socket, http(s) (client+server) and websocket library for android

An asynchronous, callback-based Http client for Android

Square’s meticulous HTTP client for the JVM, Android, and GraalVM

A type-safe HTTP client for Android and the JVM