Cache-Control headers for dynamic content

Thanks for your reply! Unfortunately, I cannot share the website URL since the site is under development and only available behind a firewall (access is restricted by our security policy at this point).

By “Dynamic Content,” I mean any page or post that can be edited in the wp-admin (for example, a “contact-us” page or “about-us” page). I double-checked and there are no other cache-control related rules on the server.

The plugin clearly sets cache-control headers for static content, like js, css, and html.

For example, if I curl an image, the server returns last-modified, cache-control, expires and eTag as expected.

curl -I https://[redacted]/wp-content/uploads/2019/08/Citizenship.png
HTTP/2 200
content-type: image/png
content-length: 257499
server: nginx
date: Wed, 02 Jun 2021 16:18:16 GMT
last-modified: Tue, 13 Aug 2019 23:00:24 GMT
accept-ranges: bytes
cache-control: max-age=31536000, public
expires: Thu, 02 Jun 2022 16:18:16 GMT
referrer-policy: no-referrer-when-downgrade
pragma: public
x-powered-by: W3 Total Cache/2.1.3
x-powered-by: PleskLin
etag: "3eddb-590079b0c5200"

However, if I try to curl a dynamic page, there are no cache-related headers (last-modified, etag, etc). This appears to be by design.

curl -I https://[redacted]/about-us/
HTTP/2 200
content-type: text/html; charset=UTF-8
server: nginx
date: Wed, 02 Jun 2021 16:20:04 GMT
vary: Accept-Encoding
x-powered-by: W3 Total Cache/2.1.3
link: <https://[redacted]/wp-json/>; rel="https://api.w.org/", <https://[redacted]/wp-json/wp/v2/pages/9>; rel="alternate"; type="application/json", <https://[redacted]/?p=9>; rel=shortlink
vary: User-Agent
referrer-policy: no-referrer-when-downgrade
x-powered-by: PleskLin