UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36

Steps to reproduce the problem:
clone/download this repository
install server dependancies : npm i
install client dependancies : cd client && npm i
start server : cd .. && npm start
open a browser at http://localhost:5000/client/build/static/js/main.js
see Etag in headers
add some text to this component jsx : client/src/components/App/App.tsx
build the client : cd client && npm run build
switch to the browser, press f5, note that the file has been loaded via memory cache
press ctrl+f5 and see that the etag has changed, but the file was loaded from cache

What is the expected behavior?
file is not loaded from cache, but downloaded from the server, despite the Etag header has changed on the resource response

What went wrong?
The file is loaded from browser cache

Did this work before? N/A 

Does this work in other browsers? N/A

Chrome version: 63.0.3239.132  Channel: n/a
OS Version: 4.13.0-43
Flash Version: