Hot Assets Server CORS 'Access-Control-Allow-Origin' Error with Webpack 2

[reconstructions]

Sorry in advance for asking for help with a problem in my own app instead of this repo...

I merged everything since ef369ed into an app I had build on top of that commit (mostly Webpack 2 and version bumps), and it broke my hot reloading:

My own app has some differences (Foreman ports are set in a development.env file, Bootstrap styles have been removed), but I have gone through and merged all the commits after the one I started from about 5 times and I cannot figure out how it breaks hot reloading.

Any advice would be greatly appreciated, otherwise I will have to try to start again from the latest commit and try and merge my whole app into it, which won't be fun.

[alex35mil]

https://github.com/alexfedoseev/blog/blob/master/server.hot.js#L23

[reconstructions]

I am going to go ahead and close this, then push a branch with Bootstrap styles removed that breaks the hot reloading. I don't think this is actionable without the context.