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| <title>Configuring HTTP/2 Push</title><link rel="stylesheet" type="text/css" href="css/docbook.css"><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"><meta name="keywords" content="jetty, servlet, servlet-api, cometd, http, websocket, eclipse, maven, java, server, software"><link rel="home" href="index.html" title="Jetty : The Definitive Reference"><link rel="up" href="http2.html" title="Chapter 15. HTTP/2"><link rel="prev" href="http2-configuring.html" title="Configuring HTTP/2"><link rel="next" href="fastcgi.html" title="Chapter 16. FastCGI Support"><link xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times" rel="shortcut icon" href="images/favicon.ico"><script type="text/javascript" src="js/shCore.js"></script><script type="text/javascript" src="js/shBrushJava.js"></script><script type="text/javascript" src="js/shBrushXml.js"></script><script type="text/javascript" src="js/shBrushBash.js"></script><script type="text/javascript" src="js/shBrushJScript.js"></script><script type="text/javascript" src="js/shBrushSql.js"></script><script type="text/javascript" src="js/shBrushProperties.js"></script><script type="text/javascript" src="js/shBrushPlain.js"></script><link type="text/css" rel="stylesheet" href="css/shCore.css"><link type="text/css" rel="stylesheet" href="css/shThemeEclipse.css"><link type="text/css" rel="stylesheet" href="css/font-awesome.min.css"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><table xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times"><tr><td style="width: 25%"><a href="http://www.eclipse.org/jetty"><img src="images/jetty-header-logo.png" alt="Jetty Logo"></a><br><span style="font-size: small"> |
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| </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="http2-configuring-push"></a>Configuring HTTP/2 Push</h2></div></div></div><p> |
| 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.</p><p>HTTP/2 Push can be automated in your application by simply configuring a |
| <a class="link" href="http://download.eclipse.org/jetty/stable-9/apidocs/org/eclipse/jetty/servlets/PushCacheFilter.html" target="_top"> |
| <code class="code">PushCacheFilter</code> |
| </a> |
| in your <code class="code">web.xml</code>, in this way:</p><div class="informalexample"><script type="syntaxhighlighter" class="brush: xml;toolbar: false"> |
| <![CDATA[ |
| |
| <?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> |
| |
| ]]> |
| </script></div><p><code class="code">PushCacheFilter</code> analyzes the HTTP requests for resources that arrive to your |
| web application. Some of these requests contain the HTTP <code class="code">Referer</code> header that points |
| to a resource that has been requested previously. This allows the <code class="code">PushCacheFilter</code> |
| to organize resources in <span class="emphasis"><em>primary</em></span> resources (those referenced by the |
| <code class="code">Referer</code> header) and <span class="emphasis"><em>secondary</em></span> resources (those that have |
| the <code class="code">Referer</code> header). |
| </p><p><code class="code">PushCacheFilter</code> 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.</p><p><code class="code">PushCacheFilter</code> can be configured with the following <code class="code">init-params</code>:</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p><code class="code">associatePeriod</code>: the time window, in milliseconds, within which a request |
| for a secondary resource will be associated to a primary resource.</p></li><li class="listitem"><p><code class="code">maxAssociations</code>: the max number of secondary resources that may be |
| associated to a primary resource.</p></li></ul></div></div><script type="text/javascript"> |
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