A web application running under HTTP/1.0 sends a request to the server when it finds references for an image file, CSS file, and any other resources needed to render a web page.
With HTTP/2.0 you still can do it, but now you can do better: the server can now push the resources beforehand, avoiding unnecessary new requests, decreasing the server load, and improving performance.
In this recipe, our resources are represented by the following:
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <link rel="stylesheet" type="text/css" href="resources/style.css"> <script src="resources/functions.js"></script>
And the push happens at this part of our filter:
HttpServletRequest httpReq = (HttpServletRequest)request; ...
