nginx remove header from upstream

Question

I have nginx with upstream.
The upstream sets headers:
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache

Because I want this page to be cached, in nginx I have following conf:
    location ~* ^.+.(html)$ {
            proxy_pass      http://websitefarm.php73;

add_header      Pragma          "";
            add_header      x-pragma        "OK";
            expires         1d;
    }

it successfully remove Expires and Cache-Control, but Pragma stays.
note my test header "x-pragma" is set. so definitely conf "works"
expires: Sat, 25 Jul 2020 12:13:04 GMT
cache-control: max-age=86400
pragma: no-cache
x-pragma: OK

if i try set "Pragma" to something else, it works, but "" not seems to work.

Michael Hampton · Answer

This is a PHP configuration issue. You have set session.cache_limiter to nocache, either by leaving it at its default or by setting it explicitly in code, or both.
If the pages of interest are indeed cacheable, and are not for logged-in users, you need to have a chat with the application's developer about the inappropriate use of sessions.

Nick · Answer

Seems like this can be removed only with proxy_hide_header directive
Following config works:
    location ~* ^.+.(html)$ {
            proxy_pass              http://websitefarm.php73;
            proxy_hide_header       Pragma;
            expires                 1d;
    }

nginx remove header from upstream

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