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HTTP/2 Push is a mechanism that allows the server to send multiple resources to the client for a single client request. This will reduce the amount of round-trips necessary to retrieve all the resources that make up a web page and can significantly improve the page load time.
HTTP/2 Push can be automated in your application by configuring a
PushCacheFilter in the
web.xml, in this way:
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" metadata-complete="true" version="3.1"> ... <filter> <filter-name>PushFilter</filter-name> <filter-class>org.eclipse.jetty.servlets.PushCacheFilter</filter-class> <async-supported>true</async-supported> </filter> <filter-mapping> <filter-name>PushFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> ... </web-app>
PushCacheFilter analyzes the HTTP requests for resources that arrive to your web application.
Some of these requests contain the HTTP
Referrer header that points to a resource that has been requested previously.
This allows the
PushCacheFilter to organize resources in to two categories: primary resources (those referenced by the
Referrer header) and secondary resources (those that have the
PushCacheFilter associates secondary resources to primary resources.
Only secondary resources that have been requested within a time window from the request of the primary resource are associated with the primary resource.
PushCacheFiltercan be configured with the following
associatePeriod: the time window, in milliseconds, within which a request for a secondary resource will be associated to a primary resource.
maxAssociations: the max number of secondary resources that may be associated to a primary resource.