How do we remove “cache-control: no-cache, must-revalidate, max-age=0” in response header? This is default value given by Cloudflare. This cache control header is set to 404 page.
That doesn’t look like a Cloudflare default. Is this on a static file (image/js/css)?
On your Caching settings page, do you have Browser Cache Expiration set to “Respect Existing Headers”?
Or maybe a Page Rule with a Cache setting?
Go to this domain “worldtest.win” and type anything random getting 404 page. In the response header, you can see 2 cache controls. This is " cache-control: public, max-age=3600" set by me. and don’t know, who sets this " cache-control:no-cache, must-revalidate, max-age=0". According to Google, this sets by CDN provider.
Yeah. Browser Cache Expiration sets to Respect Existing Headers.
I suspect it’s a WordPress plugin. Are you running a page caching plugin?
Oh, and if you want to find out for sure, 
that domain (then wait a few minutes for DNS to propagate), then watch the headers.
Ok. see you later. I’ll do DNS propagate.
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