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What should the expiration header, cache control, and pragma header fields be set to?

I have a website where I update content about once a month. When I check the header fields of the HTTP request, I get the following output:

Expires: Thu, 19 Nov 1981 08:52:00 GMT  
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0   
Pragma: no-cache

My question is that, given the frequency with which I update the content, I am thinking of manually setting these fields to enable caching of the site. I am using php header (); team for this.

Therefore, my question is: what should the header fields of the HTTP headers be set for expiration, cache control and pragma? Also, should I set other fields in addition to these?

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Expires , .

Pragma

Cache-Control : public max-age = 2592000

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