rprxy.xyz gets terminated for usage if too many requests are made. I prefer using e.g. heroku as proxy, See This forum post about it. The post explains really well how to set it up and all. What I did is retrieve the version from the url the proxy sends back and use that as a notifier to users that a new version is available.
You save the plugin locally to test it out, when uploaded everyone will receive a HTTP request prompt at the beginning. that’s the inevitable. just explain that there are no malicious intents bound to it if that’s true atleast.