Beware of ETag Even if you are using nocache, the ETag header isn’t removed, because it works in a different way. It’s generated at the end of the request and could be another source of unintended caching. In order to handle it you have two choices. app.set The first is disabling it using express builtin app.set(‘etag’, false); method. on-headers The second is removing the header just before …
https://stackoverflow.com/questions/22632593/how-to-disable-webpage-caching-in-expressjs-nodejs