PHP,NGINX problem

I directly modified the PHP code on the server and set the http header not to be cached. Why do you see the cache every time on the browser, waiting for an average of half a minute to one minute is the latest code effect? could you tell me which part has gone wrong and how to solve it?

Mar.01,2021

if you are in a hurry, you can simply < kbd > Ctrl < / kbd > + < kbd > F5 < / kbd > clear the browser cache
in addition, you can check whether the cache is set on the nginx server.

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