Help request: How to change a project created with vue-cli to use http-vue-loader

[UedaTakeyuki]

Thank you for your providing an excellent project. I'm trying to change my project using vue from NPM to CDN. Now my project changed to importing the required library from CDN except for the vue-loader.

So, I'm trying to replace from using vue-loader to useing http-vue-loader, but the result is White Screen with [HMR] Waiting for update signal from WDS...

I have totally no idea what is happening and what was wrong. So, any suggestions would be so appreciated.

The detail of my steps is also reported this SO.
Also, reproducing environment is available at https://github.com/UedaTakeyuki/http-vue-loader.

Thank you for your kind suggestion.