The context here is that we are changing a particular header value from "private" to "no-store": https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control. Most deployments don't involve any caching proxies and so there won't be any change in behavior. If you do have a proxy it's something you may consider if that proxy is currently doing any caching - with the current header values, caching is allowed but not required.