http://eweiibe6tdjsdprb4px6rqrzzcsi22m4koia44kc5pcjr7nec2rlxyad.onion/help/administration/integration/plantuml.md
Next, you can:
Configure local PlantUML access . Ensure the proxy_pass port
configured in the link matches the Connector port in server.xml .
Verify that the PlantUML installation succeeded.
Configure local PlantUML access
The PlantUML server runs locally on your server, so it can't be accessed
externally by default.