Using Server Push to make objects available beforehand

One of the most important new features of Jakarta Servlet 4 is its HTTP/2.0 support. It brings another cool and reliable feature – Server Push.

This recipe will show you how to use Server Push in a filter and push the resources needed in every request that we want.

Getting ready

First, we need to add the required dependencies:

<dependency>
    <groupId>javax</groupId>
    <artifactId>javaee-api</artifactId>
    <version>8.0</version>
    <scope>provided</scope>
</dependency>

How to do it...

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