tomcat 에서 www 강제로 붙이는 방법

정말 한참을 찾았다..ㅡㅡ;

<rule>
  <name>Canonical Hostnames</name>
  <condition name="host" operator="notequal">^www.mydomain.com</condition>
  <condition name="host" operator="notequal">^$</condition>
  <from>^/(.*)</from>
  <to type="redirect" last="true">http://www.mydomain.com/$1</to>
</rule>

출처: http://stackoverflow.com/questions/2488816/automatically-add-www-on-tomcat