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Version: 9.4.18-SNAPSHOT
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Setting Max Form Size

For a Single Webapp
For All Apps on a Server
For All Apps in the JVM

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.

For a Single Webapp

The method to invoke is: ContextHandler.setMaxFormContentSize(int maxSize);

This can be done either in a context XML deployment descriptor external to the webapp, or in a jetty-web.xml file in the webapp’s WEB-INF directory.

In either case the syntax of the XML file is the same:

<Configure class="org.eclipse.jetty.webapp.WebAppContext">
  <!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -->
  <!-- Max Form Size                                                   -->
  <!-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -->
  <Set name="maxFormContentSize">200000</Set>

For All Apps on a Server

Set an attribute in jetty.xml on the Server instance for which you want to modify the maximum form content size:

<Configure class="org.eclipse.jetty.server.Server">
  <Call name="setAttribute">


It is important to remember that you should not modify the XML files in your $JETTY_HOME. 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 $JETTY_BASE in an /etc directory. Jetty will always look first to the $JETTY_BASE for configuration.

For All Apps in the JVM

Use the system property org.eclipse.jetty.server.Request.maxFormContentSize. This can be set on the command line or in the $JETTY_BASE\start.ini or any $JETTY_BASE\start.d\*.ini module ini file. Using $JETTY_BASE\start.d\server.ini as an example:

# ---------------------------------------
# Module: server
# Enables the core Jetty server on the classpath.
# ---------------------------------------

### Common HTTP configuration
## Scheme to use to build URIs for secure redirects
# jetty.httpConfig.secureScheme=https



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