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The Cache You Cannot Reach
Every cache so far in this chapter has had an off switch. You can flush Redis, purge a , restart a process. The browser cache has none of that, because it is on somebody else's laptop.
ComparisonFigure 1. Every other cache in this chapter can be emptied
There is no request you can send to a browser to make it forget something, on any browser, by any means. So a wrong Cache-Control header is not an incident you fix. It is one you wait out.
That asymmetry shapes every recommendation that follows.
Three Outcomes, and the Best One Is Silent
SequenceFigure 2. The best outcome draws no arrow, because nothing goes over the network
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