Tomcat not compressing js files

Question

I used gzip compression in tomcat for my website. Below is the connector code-

 <Connector SSLEnabled="true" clientAuth="false" maxThreads="150"   port="9093" protocol="HTTP/1.1" scheme="https" secure="true" sslProtocol="TLS"
     compression="on"
    compressionMinSize="2048"
    noCompressionUserAgents="gozilla, traviata"
    compressableMimeType="text/html,text/xml,text/css,text/javascript, application/x-javascript,application/javascript"
    />

I checked size of one js file in browser console before compression. It was around 157KB and that time content-encoding was not present.

Then I implemented compression, checked size again and it was same i.e 157KB. This time content-encoding was present i.e gzip It means gzip compression implemented but js file didn't compress. Why? Any alternate?

Answer 1

Have you added the option useSendfile="off" in Connector sector? Files larger than 48KB may not be compressed even if compression="on".

See Tomcat conf-ref https://tomcat.apache.org/tomcat-8.0-doc/config/http.html and search compression.