While setting up SSL reverse proxy using lets encrypt and nginx i had a few troubles with testing via googles Chrome browser.
Chrome caches some SSL responses which can be cleared by deleting your browsing data via settings or Ctrl+Shift+Del.
Chrome also caches http -> https redirects, you can see these by going to chrome://net-internals and select “HSTS” from the drop down. Enter the domain name under “Delete domain” and press the Delete button
The easiest thing to do during testing is use incognito mode. You will not need to clear the cache every time you change config or re-issue certificates.