Looking at my log I’ve noticed that some pages were not cached. After a
bit of debugging I’ve noticed that the order in which the HTTP header
are returned from Apache change how NGINX this save the page in the
So a page with this code is NOT cached<?php header('Content-Type: text/html; charset=UTF-8'); header('Last-Modified: Wed, 22 Feb 2012 14:44:11 GMT'); header('Expires: Wed, 11 Jan 1984 05:00:00 GMT'); header("X-Accel-Expires: 600"); header('Cache-Control: no-cache, must-revalidate, max-age=0'); header('Pragma: no-cache'); Echo "Hello World !"; ?>
if I comment/delete the line header(‘Expires: Wed, 11 Jan 1984 05:00:00
GMT’); the page is cached.
Even if I move header(“X-Accel-Expires: 600”) before header(‘Expires:
Wed, 11 Jan 1984 05:00:00 GMT’); the page is cached
Same thing happen for the header Cache-Control. If is before
X-Accel-Expires the page is not cached if is after it is !
The conf for NGINX is very standard and proxy_cache_valid is not
Is this correct ? Where am I wrong ?