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| <title>Setting Max Form Size</title><link rel="stylesheet" type="text/css" href="css/docbook.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><meta name="keywords" content="jetty, servlet, servlet-api, cometd, http, websocket, eclipse, maven, java, server, software"><link rel="home" href="index.html" title="Jetty"><link rel="up" href="configuring-contexts.html" title="Chapter 5. Configuring Contexts"><link rel="prev" href="custom-error-pages.html" title="Creating Custom Error Pages"><link rel="next" href="configuring-connectors.html" title="Chapter 6. Configuring Jetty Connectors"><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"><link rel="stylesheet" href="css/highlighter/foundation.css"><script src="js/highlight.pack.js"></script><script> |
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| Version: 9.4.28-SNAPSHOT</span></td><td style="width: 50%"></td></tr></table><div 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" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Setting Max Form Size</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="custom-error-pages.html"><i class="fa fa-chevron-left" aria-hidden="true"></i> Previous</a> </td><th width="60%" align="center">Chapter 5. Configuring Contexts<br><a accesskey="p" href="index.html"><i class="fa fa-home" aria-hidden="true"></i> Home</a></th><td width="20%" align="right"> <a accesskey="n" href="configuring-connectors.html">Next <i class="fa fa-chevron-right" aria-hidden="true"></i></a></td></tr></table><hr></div><div 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" class="jetty-callout"><h5 class="callout"><a href="http://www.webtide.com/">Contact the core Jetty developers at |
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| </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="setting-form-size"></a>Setting Max Form Size</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="section"><a href="setting-form-size.html#_for_a_single_webapp">For a Single Webapp</a></span></dt><dt><span class="section"><a href="setting-form-size.html#_for_all_apps_on_a_server">For All Apps on a Server</a></span></dt><dt><span class="section"><a href="setting-form-size.html#_for_all_apps_in_the_jvm">For All Apps in the JVM</a></span></dt></dl></div><p>Jetty limits the amount of data that can post back from a browser or other client to the server. |
| This helps protect the server against denial of service attacks by malicious clients sending huge amounts of data. |
| The default maximum size Jetty permits is 200000 bytes. |
| You can change this default for a particular webapp, for all webapps on a particular Server instance, or all webapps within the same JVM.</p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="_for_a_single_webapp"></a>For a Single Webapp</h3></div></div></div><p>The method to invoke is: <code class="literal">ContextHandler.setMaxFormContentSize(int maxSize);</code></p><p>This can be done either in a context XML deployment descriptor external to the webapp, or in a <code class="literal">jetty-web.xml</code> file in the webapp’s <code class="literal">WEB-INF</code> directory.</p><p>In either case the syntax of the XML file is the same:</p><pre 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"><code><Configure class="org.eclipse.jetty.webapp.WebAppContext"> |
| <!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - --> |
| <!-- Max Form Size --> |
| <!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - --> |
| <Set name="maxFormContentSize">200000</Set> |
| </Configure></code></pre></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="_for_all_apps_on_a_server"></a>For All Apps on a Server</h3></div></div></div><p>Set an attribute in <code class="literal">jetty.xml</code> on the Server instance for which you want to modify the maximum form content size:</p><pre 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"><code><Configure class="org.eclipse.jetty.server.Server"> |
| <Call name="setAttribute"> |
| <Arg>org.eclipse.jetty.server.Request.maxFormContentSize</Arg> |
| <Arg>200000</Arg> |
| </Call> |
| </Configure></code></pre><div class="blockquote"><blockquote class="blockquote"><div 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" class="important" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title"><i class="fa fa-plus" aria-hidden="true"></i> Important</h3><p>It is important to remember that you should <span class="strong"><strong>not</strong></span> modify the XML files in your <code class="literal">$JETTY_HOME</code>. |
| If you do for some reason feel you want to change the way an XML file operates, it is best to make a copy of it in your <code class="literal">$JETTY_BASE</code> in an <code class="literal">/etc</code> directory. |
| Jetty will always look first to the <code class="literal">$JETTY_BASE</code> for configuration.</p></div></blockquote></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="_for_all_apps_in_the_jvm"></a>For All Apps in the JVM</h3></div></div></div><p>Use the system property <code class="literal">org.eclipse.jetty.server.Request.maxFormContentSize</code>. |
| This can be set on the command line or in the <code class="literal">$JETTY_BASE\start.ini</code> or any <code class="literal">$JETTY_BASE\start.d\*.ini</code> <a class="link" href="startup-modules.html" title="Managing Startup Modules">module ini file.</a> |
| Using <code class="literal">$JETTY_BASE\start.d\server.ini</code> as an example:</p><pre 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"><code># --------------------------------------- |
| # Module: server |
| # Enables the core Jetty server on the classpath. |
| # --------------------------------------- |
| --module=server |
| |
| ### Common HTTP configuration |
| ## Scheme to use to build URIs for secure redirects |
| # jetty.httpConfig.secureScheme=https |
| |
| ... |
| |
| -Dorg.eclipse.jetty.server.Request.maxFormContentSize=200000</code></pre></div></div><script type="text/javascript"> |
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