documentation/9.3.0.v20150612/gzip-filter.html - www.eclipse.org/jetty - Git at Google

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    <title>Gzip Handler</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="advanced-extras.html" title="Chapter&nbsp;17.&nbsp;Provided Servlets, Filters, and Handlers"><link rel="prev" href="dos-filter.html" title="Denial of Service Filter"><link rel="next" href="cross-origin-filter.html" title="Cross Origin Filter"><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">
             Version: 9.3.0.v20150612</span></td><td style="width: 50%"><script type="text/javascript">  (function() {
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       </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="gzip-filter"></a>Gzip Handler</h2></div></div></div><div class="toc"><dl><dt><span class="section"><a href="gzip-filter.html#gzip-filter-metadata">Info</a></span></dt><dt><span class="section"><a href="gzip-filter.html#gzip-filter-usage">Usage</a></span></dt><dt><span class="section"><a href="gzip-filter.html#gzip-filter-rules">Gzip Rules</a></span></dt><dt><span class="section"><a href="gzip-filter.html#gzip-filter-init">Gzip Configuration</a></span></dt></dl></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="gzip-filter-metadata"></a>Info</h3></div></div></div><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>Classname:
         <code class="code">org.eclipse.jetty.server.handler.gzip.GzipHandler</code></p></li><li class="listitem"><p>Maven Artifact: org.eclipse.jetty:jetty-servlets</p></li><li class="listitem"><p>Javadoc: <a class="link" href="http://download.eclipse.org/jetty/stable-9/apidocs/org/eclipse/jetty/server/handler/gzip/GzipHandler.html" target="_top">
         http://download.eclipse.org/jetty/stable-9/apidocs/org/eclipse/jetty/server/handler/gzip/GzipHandler.html
         </a></p></li><li class="listitem"><p>Xref: <a class="link" href="http://download.eclipse.org/jetty/stable-9/xref/org/eclipse/jetty/server/handler/gzip/GzipHandler.html" target="_top">
         http://download.eclipse.org/jetty/stable-9/xref/org/eclipse/jetty/server/handler/gzip/GzipHandler.html
         </a></p></li></ul></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="gzip-filter-usage"></a>Usage</h3></div></div></div><p>The Jetty GzipHandler is a compression handler that you can apply to
     any dynamic resource (servlet). It fixes many of the bugs in commonly
     available compression filters: it works with asynchronous servlets; it
     handles all ways to set content length. We have tested it with Jetty
     continuations and suspending requests. Some user-agents might be excluded
     from compression to avoid common browser bugs (yes, this means
     IE!).</p><p>The GzipHandler is added to the entire server by the
     etc/jetty-gzip.xml file from the gzip.mod module. It may also be added to
     individual contexts in a context xml file.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="gzip-filter-rules"></a>Gzip Rules</h3></div></div></div><p>GZIP Handler will gzip or deflate the content of a response
     if:</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>It is mapped to a matching path</p></li><li class="listitem"><p>The request method is configured to support gzip</p></li><li class="listitem"><p>The request is not from an excluded User-Agent</p></li><li class="listitem"><p>accept-encoding header is set to either gzip, deflate or a
         combination of those</p></li><li class="listitem"><p>The response status code is &gt;=200 and &lt;300</p></li><li class="listitem"><p>The content length is unknown or more than the minGzipSize
         initParameter or the minGzipSize is 0(default)</p></li><li class="listitem"><p>The content-type does not match an excluded mime-type</p></li><li class="listitem"><p>No content-encoding is specified by the resource</p></li></ul></div><p>If both gzip and deflate are specified in the accept-encoding
     header, then gzip will be used.</p><p>Compressing the content can greatly improve the network bandwidth
     usage, but at a cost of memory and CPU cycles. The <a class="link" href="advanced-extras.html#default-servlet" title="Default Servlet">DefaultServlet</a> is capable of serving
     pre-compressed static content, which saves memory and CPU. By default, the
     GzipHandler will check to see if pre-compressed content exists, and pass
     the request through to be handled by the DefaultServlet.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="gzip-filter-init"></a>Gzip Configuration</h3></div></div></div><div class="variablelist"><dl><dt><span class="term">minGzipSize</span></dt><dd><p>Content will only be compressed if content length is either
           unknown or greater than minGzipSize.</p></dd><dt><span class="term">checkGzExists</span></dt><dd><p>True by default. If set to false, the handler will not check
           for pre-compressed content.</p></dd><dt><span class="term">compressionLevel</span></dt><dd><p>The compression level used for deflate compression.
           (0-9).</p></dd><dt><span class="term">includedMethods</span></dt><dd><p>List of HTTP methods to compress. If not set, only GET
           requests are compressed.</p></dd><dt><span class="term">includedMimeTypes</span></dt><dd><p>List of mime types to compress.</p></dd><dt><span class="term">excludedMimeTypes</span></dt><dd><p>List of mime types not to compress.</p></dd><dt><span class="term">excludedAgentPatterns</span></dt><dd><p>A list of regex patterns for User-Agent names from which
           requests should not be compressed.</p></dd><dt><span class="term">excludedPaths</span></dt><dd><p>List of paths to exclude from compression. Does a
           String.startsWith(String) comparison to check if the path matches.If
           it does match -&gt; no compression. To match subpaths use
           excludePathPatterns instead.</p></dd><dt><span class="term">includedPaths</span></dt><dd><p>List of paths to consider for compression.</p></dd><dt><span class="term">includePaths</span></dt><dd><p>List of paths to definitely consider for compression.</p></dd></dl></div></div></div><script type="text/javascript">
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	<title>Gzip Handler</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="advanced-extras.html" title="Chapter 17. Provided Servlets, Filters, and Handlers"><link rel="prev" href="dos-filter.html" title="Denial of Service Filter"><link rel="next" href="cross-origin-filter.html" title="Cross Origin Filter"><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">
	Version: 9.3.0.v20150612</span></td><td style="width: 50%"><script type="text/javascript"> (function() {
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	private support for your internal/customer projects ... custom extensions and distributions ... versioned snapshots for indefinite support ...
	scalability guidance for your apps and Ajax/Comet projects ... development services from 1 day to full product delivery
	</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="gzip-filter"></a>Gzip Handler</h2></div></div></div><div class="toc"><dl><dt><span class="section"><a href="gzip-filter.html#gzip-filter-metadata">Info</a></span></dt><dt><span class="section"><a href="gzip-filter.html#gzip-filter-usage">Usage</a></span></dt><dt><span class="section"><a href="gzip-filter.html#gzip-filter-rules">Gzip Rules</a></span></dt><dt><span class="section"><a href="gzip-filter.html#gzip-filter-init">Gzip Configuration</a></span></dt></dl></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="gzip-filter-metadata"></a>Info</h3></div></div></div><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>Classname:
	<code class="code">org.eclipse.jetty.server.handler.gzip.GzipHandler</code></p></li><li class="listitem"><p>Maven Artifact: org.eclipse.jetty:jetty-servlets</p></li><li class="listitem"><p>Javadoc: <a class="link" href="http://download.eclipse.org/jetty/stable-9/apidocs/org/eclipse/jetty/server/handler/gzip/GzipHandler.html" target="_top">
	http://download.eclipse.org/jetty/stable-9/apidocs/org/eclipse/jetty/server/handler/gzip/GzipHandler.html
	</a></p></li><li class="listitem"><p>Xref: <a class="link" href="http://download.eclipse.org/jetty/stable-9/xref/org/eclipse/jetty/server/handler/gzip/GzipHandler.html" target="_top">
	http://download.eclipse.org/jetty/stable-9/xref/org/eclipse/jetty/server/handler/gzip/GzipHandler.html
	</a></p></li></ul></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="gzip-filter-usage"></a>Usage</h3></div></div></div><p>The Jetty GzipHandler is a compression handler that you can apply to
	any dynamic resource (servlet). It fixes many of the bugs in commonly
	available compression filters: it works with asynchronous servlets; it
	handles all ways to set content length. We have tested it with Jetty
	continuations and suspending requests. Some user-agents might be excluded
	from compression to avoid common browser bugs (yes, this means
	IE!).</p><p>The GzipHandler is added to the entire server by the
	etc/jetty-gzip.xml file from the gzip.mod module. It may also be added to
	individual contexts in a context xml file.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="gzip-filter-rules"></a>Gzip Rules</h3></div></div></div><p>GZIP Handler will gzip or deflate the content of a response
	if:</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>It is mapped to a matching path</p></li><li class="listitem"><p>The request method is configured to support gzip</p></li><li class="listitem"><p>The request is not from an excluded User-Agent</p></li><li class="listitem"><p>accept-encoding header is set to either gzip, deflate or a
	combination of those</p></li><li class="listitem"><p>The response status code is >=200 and <300</p></li><li class="listitem"><p>The content length is unknown or more than the minGzipSize
	initParameter or the minGzipSize is 0(default)</p></li><li class="listitem"><p>The content-type does not match an excluded mime-type</p></li><li class="listitem"><p>No content-encoding is specified by the resource</p></li></ul></div><p>If both gzip and deflate are specified in the accept-encoding
	header, then gzip will be used.</p><p>Compressing the content can greatly improve the network bandwidth
	usage, but at a cost of memory and CPU cycles. The <a class="link" href="advanced-extras.html#default-servlet" title="Default Servlet">DefaultServlet</a> is capable of serving
	pre-compressed static content, which saves memory and CPU. By default, the
	GzipHandler will check to see if pre-compressed content exists, and pass
	the request through to be handled by the DefaultServlet.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="gzip-filter-init"></a>Gzip Configuration</h3></div></div></div><div class="variablelist"><dl><dt><span class="term">minGzipSize</span></dt><dd><p>Content will only be compressed if content length is either
	unknown or greater than minGzipSize.</p></dd><dt><span class="term">checkGzExists</span></dt><dd><p>True by default. If set to false, the handler will not check
	for pre-compressed content.</p></dd><dt><span class="term">compressionLevel</span></dt><dd><p>The compression level used for deflate compression.
	(0-9).</p></dd><dt><span class="term">includedMethods</span></dt><dd><p>List of HTTP methods to compress. If not set, only GET
	requests are compressed.</p></dd><dt><span class="term">includedMimeTypes</span></dt><dd><p>List of mime types to compress.</p></dd><dt><span class="term">excludedMimeTypes</span></dt><dd><p>List of mime types not to compress.</p></dd><dt><span class="term">excludedAgentPatterns</span></dt><dd><p>A list of regex patterns for User-Agent names from which
	requests should not be compressed.</p></dd><dt><span class="term">excludedPaths</span></dt><dd><p>List of paths to exclude from compression. Does a
	String.startsWith(String) comparison to check if the path matches.If
	it does match -> no compression. To match subpaths use
	excludePathPatterns instead.</p></dd><dt><span class="term">includedPaths</span></dt><dd><p>List of paths to consider for compression.</p></dd><dt><span class="term">includePaths</span></dt><dd><p>List of paths to definitely consider for compression.</p></dd></dl></div></div></div><script type="text/javascript">
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