Servlet 4.0 is one the of biggest APIs of Java EE 8. Since the very beginning of the Java EE platform (the old J2EE), the Servlet specification has always played a key role.

The coolest additions of this version are surely HTTP/2.0 and Server Push. Both of them bring performance improvements to your application.

This recipe will use Server Push to do one of the most basic tasks in a web page—loading an image.