Hi,
I installed plantuml.war on Tomcat7.0.68, and it works great.
Now I want to use PlantUML Gizmo and set Gizmo to use my PlantUML server.
I followed the "Can I specify a different PlantUML server (on a private network)?" section at here and added CORS filter in $CATALINA_BASE/conf/web.xml.
Now generating diagram is OK via Gizmo.
But when inserting diagram from Gizmo to google doc, it says "Unable to transfer image as "data:..." URL.".

I don't know how to do "install a version of the PlantUML server (coming soon) that supports "data:..." URIs for images". Can you kindly give me hints about this?
And since Gizmo works perfect with http://www.plantuml.com/plantuml, I'd like to know which servlet container do you use?
Thank you for any comments.