fetch (), how do you make a non-cached request?

Fetch can take an init object containing many custom settings that you might want to apply to the request, this includes an option called “headers”. The “headers” option takes a Header object. This object allows you to configure the headers you want to add to your request. By adding pragma: no-cache and a cache-control: no-cache to your header you will force the browser to check the server to …

https://stackoverflow.com/questions/29246444/fetch-how-do-you-make-a-non-cached-request