We use the PushBuilder object to send an image to the client before it is requested by the img src tag. In other words, the browser doesn't need to do another request (what it usually does with img src) to have an image available for rendering.
It might seem as if it doesn't make too much difference for a single image, but it would with dozens, hundreds, or thousands of images. Less traffic for your client and from your server. Better performance for all!
Get Java EE 8 Cookbook now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
Get Mark Richards’s Software Architecture Patterns ebook to better understand how to design components—and how they should interact.
Dive in for free with a 10-day trial of the O’Reilly learning platform—then explore all the other resources our members count on to build skills and solve problems every day.
Start your free trial Become a member now