<extensions>

</extensions>

<system-properties>
    <property name="org.apache.coyote.http11.Http11Protocol.COMPRESSION" value="on"/>
    <property name="org.apache.coyote.http11.Http11Protocol.COMPRESSION_MIME_TYPES" value="text/javascript,text/css,text/html,text/xml,text/json"/>  <!-- add other content types you want to gzip -->
</system-properties>