I have set up Jetty 9.3 with two XML context configurations. One for static content:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure_9_0.dtd">
<Configure class="org.eclipse.jetty.server.handler.ContextHandler">
  <Set name="contextPath">/static</Set>
  <Set name="handler">
    <New class="org.eclipse.jetty.server.handler.ResourceHandler">
      <Set name="resourceBase">/home/user/static</Set>
      <Set name="directoriesListed">true</Set>
    </New>
  </Set>
</Configure>
and one for a web application (WAR file):
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure.dtd">
<Configure class="org.eclipse.jetty.webapp.WebAppContext">
  <Set name="contextPath">/webapp</Set>
  <Set name="war">/home/user/webapp.war</Set>
</Configure>
I then used this answer to set up Jetty to forward HTTP requests to HTTPS. More specifically, I added the following to jetty/etc/webdefault.xml:
<security-constraint>
  <web-resource-collection>
   <web-resource-name>Everything</web-resource-name>
   <url-pattern>/*</url-pattern>
  </web-resource-collection>
  <user-data-constraint>
   <transport-guarantee>CONFIDENTIAL</transport-guarantee>
  </user-data-constraint>
</security-constraint>
and added the following to my HttpConfiguration in jetty/etc/jetty.xml:
<Call name="addCustomizer">
  <Arg>
    <New class="org.eclipse.jetty.server.SecureRequestCustomizer" />
  </Arg>
</Call>
This works perfectly for my web application (i.e. accessing the server through HTTP at '/webapp' will redirect to HTTPS), but doesn't seem to affect the static content served under '/static'. I assume this is because the setting added to webdefault.xml only applies to web applications since they have an applicable web.xml file.
How can I set up HTTP requests to redirect to HTTPS for all my pages served as static content?