If your Rails application is using Webpack you need to serve assets on the same host as you application runs, otherwise you will see the following errors in your browser console:

[WDS] Disconnected!
Invalid Host header

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So if you are using awesome.vcap.me:3000 you need to start the webpack-dev-server with a different host than localhost (0.0.0.0):

bin/webpack-dev-server --host awesome.vcap.me