Cronet is the networking stack of Chromium put into a library for use on mobile. This is the same networking stack that is used in the Chrome browser by over a billion people. It offers an easy-to-use, high performance, standards-compliant, and secure way to perform HTTP requests. Cronet has support for both Android and iOS. On Android, Cronet offers its own Java asynchronous API as well as support for the java.net.HttpURLConnection API. This document gives a brief introduction to using these two Java APIs.