fastcgi cache is always missed

xyzulu

In a default Wordpress install (with a commercial template, ie avada), with NGINX and fastcgi enable.. the cache is always missed. I suspect it's related to fastcgi_ignore_headers Cache-Control Expires;
In any case, it's strange that I am the first person to bring this up.. any suggestion on how enhance is handling this fairly normal situation?

I recall this being an issue years ago with fastcgi, but usually the implementation should take into account that most templates are settings cookies now for even first time visitors (cloudflare add a number of cookies when proxy is on) .. and we don't want those visits to miss the cache. There should be a certain list of cookies that will miss the cache.. ie woocommerce cookies etc.. but the list should be small.

Adam

The list of cookies which cause a cache bypass is fairly small. I've just copied this from a live site running on Enhance with Nginx.

if ($http_cookie ~* "comment_author|wordpress_[a-f0-9]+|wp-postpass|wordpress_no_cache|wordpress_logged_in") {
                set $skip_cache 1;
}

This config was based on customer feedback when the Nginx feature was originally developed.

I understand the issue is with commercial themes but do you know of a free theme which causes cache misses where the user is not logged in? If so, we can add it to the test suite and try to figure out why.

xyzulu

I’ll do some digging and get back to you.

xyzulu

@Adam here is what I use on some of my servers:

Skip cache with:

and

But I think this is where the real issue is.. on my current setup I IGNORE the following query strings.. ie still cache the urls:

utm_source
utm_medium
utm_campaign
utm_expid
fb_action_ids
fb_action_types
fb_source
fbclid
gclid
age-verified
ao_noptimize
usqp
cn-reloaded
_ga

If you email me, I can provide you some live examples.. use the email address in my profile is fine.

xyzulu

xyzulu index.php

I'm wondering about this on Enhance since there is a rewrite needed on Nginx with Wordpress and the index.php file.. but I may need to think more 😉