Configuration GZip at Wildfly

Question

I'm with a problem to configure the GZip in my Wildfly server used the following configuration on the server:

<subsystem xmlns="urn:jboss:domain:undertow:1.2">
        <buffer-cache name="default"/>
        <server name="default-server">
            <http-listener name="default" socket-binding="http"/>
            <host name="default-host" alias="localhost">
                <location name="/" handler="welcome-content"/>
                <filter-ref name="gzipFilter" predicate="path-suffix['.css'] or path-suffix['.js'] or path-suffix['.xhtml']"/>
                <filter-ref name="server-header"/>
                <filter-ref name="x-powered-by-header"/>
            </host>
        </server>
        <servlet-container name="default">
            <jsp-config/>
            <websockets/>
        </servlet-container>
        <handlers>
            <file name="welcome-content" path="${jboss.home.dir}/welcome-content"/>
        </handlers>
        <filters>
            <response-header name="server-header" header-name="Server" header-value="Wildfly 8"/>
            <response-header name="x-powered-by-header" header-name="X-Powered-By" header-value="Undertow 1"/>
            <gzip name="gzipFilter"/>
        </filters>
    </subsystem>

And became the Zip file of the request correctly, however I would like to set the minimum size for files to be zipped and what I'm hard, anyone know how to set the minimum size for the server do the zip before sends them to the customer?

Answer 1

There is a predicate in undertow min-content-size so you can use predicate=min-content-size[500]

I found the available predicates here https://github.com/undertow-io/undertow/tree/master/core/src/main/java/io/undertow/predicate due to lack of documentation

Answer 2

Expanding on Alexander's answer I did some tests. Strangely enough the predicate to only compress files larger then 500 bytes is not min-content-size[500].

To configure it using jboss-cli.sh run this script:

/subsystem=undertow/configuration=filter/gzip=gzipFilter:add()
/subsystem=undertow/server=default-server/host=default-host/\
   filter-ref=gzipFilter:add(predicate="not min-content-size[500]")

Note that the gzip filter will start to work after server reload. You can do this using cli's command :reload.

To test if the filter is enabled I used:

wget $MY_URL -S --header="accept-encoding: gzip" \
  -O /dev/null 2>&1| grep Content-Encoding