My written thing is realized by standalone.
Because XMLRPC server is internal server within robot(127.0.0.1).
You may refer the following.
Regards.
https://forum.universal-robots.com/t/sample-getrobotdata-real-time-client-reader-urcap/1195
https://forum.universal-robots.com/t/sample-get-controller-time-in-urscript/1256