Is there a way to stop caching at all level?

I have added

* expires -1;*
* add_header Cache-Control "private, must-revalidate, max-age=0";*
* add_header Last-Modified "";*

this on my nginx server block, but there are still some caching are
happening. Any way to get rid of that completely. :)
Mrinmoy Das
http://goromlagche.in/
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