Request context
Both values below come from your request, and both are produced on the server. Change the query string or your browser's language and reload.
Why this is not free
Everything the render depends on has to be in the cache key too, or the first visitor's page is served to the next one. Cookies and credentials are deliberately not carried at all: a personal render is either uncached, at 0.6 s per request per visitor, or cached per user, where one wrong key hands someone another person's page. Requests carrying them are refused rather than answered wrongly.