In this article, Scott Jehl suggests managing performance differently for new and returning visitors and that we could use a service worker (rather than a cookie) as a means of having the browser tell the server which category the request falls under.
The Clear-Site-Data HTTP header clears browsing data (cookies, storage, cache) associated with the requesting website. It can even be used to deregister service workers.
As a side note, I wonder if it might be an idea for me to update my website boilerplate to contain pages such as /clear-cookies, /clear-storage, and /clear-all. Then, if someone is having some weird cacheing-related problem on a website I developed, I can simply provide them with a link to one of those pages rather than asking them to hard-refresh or launch incognito windows.
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