Best Max Age on The Server Side!

One more question.
In your plugin s-max-age = 1 year ( Cloudflare cache )

But ın Cloudflare page rules maximum Edge ttl is amonth minimum 2 hours.
So ıf you set s-max-age = 1 year (or seconds) How can you ensure to stay cached files on Cloudflare more than a month?

@isaumya Thank you.

I did some tests.
When i activate Browser cache it gave me below codes

    location ~* \.(xml|xsl)$ { add_header Cache-Control "no-cache, no-store, must-revalidate, max-age=0"; expires -1; }
location /robots.txt { add_header Cache-Control "no-cache, no-store, must-revalidate, max-age=0"; expires -1; }
location ~* \.(css|js|pdf)$ { add_header Cache-Control "public, must-revalidate, proxy-revalidate, immutable, max-age=2592000, stale-while-revalidate=86400, stale-if-error=604800"; expires 30d; }
location ~* \.(jpg|jpeg|png|gif|ico|eot|swf|svg|webp|avif|ttf|otf|woff|woff2|ogg|mp4|mpeg|avi|mkv|webm|mp3)$ { add_header Cache-Control "public, must-revalidate, proxy-revalidate, immutable, max-age=31536000, stale-while-revalidate=86400, stale-if-error=604800"; expires 365d; }
location /wp-cron.php { add_header Cache-Control "no-cache, no-store, must-revalidate, max-age=0"; expires -1; }
location = /wp-content/wp-cloudflare-super-page-cache/wifisifrekirici.com/debug.log { access_log off; deny all; }

It works great.

I removed my code
"location ~* \.(css|gif|ico|jpeg|jpg|js|png|woff|woff2)$ { expires max; log_not_found off; }
” from nginx blocked

I understood well that with browser cache function, your plugin enables browser caching rules for assets such like images, CSS, scripts, etc.

I did some tests on https://cache-checker.com/ for image links!
Before when i use my expires max block for image this site cache-checker give “We couldn’t detect a caching mechanism on your website. error but when i activated Browser cache and added Plugins code to my nginx block it works perfect and did not give error at cache-checker.

I did not understand something about plugin.
I hope you can explain me.
When i test urls in this site it gives an error
“We couldn’t detect a caching mechanism on your website.”
Before i get this error for image links as well but i activated Browser cache and added plugins code en it was fixed.

What is
Overwrite the cache-control header for WordPress’s pages using web server rules?
Should i enable it? If i enable it i think many cache checker sites will not give error.

I Tried to activate it but there is a problem.
When i activate it, it gives this codes:

Edit the main Nginx configuration file, usually /etc/nginx.conf, and enter these rules immediately after opening the http block:

    map $upstream_http_x_wp_cf_super_cache_active $wp_cf_super_cache_active {
        default  'no-cache, no-store, must-revalidate, max-age=0';
        '1' 's-maxage=31536000, max-age=60';
    }
                        
Now open the configuration file of your domain and add the following rules inside the block that deals with the management of PHP pages:

    more_clear_headers 'Pragma';
    more_clear_headers 'Expires';
    more_clear_headers 'Cache-Control';
    add_header Cache-Control $wp_cf_super_cache_active;
                            
Save and restart Nginx.

There is no problem with map block because i added it to nginx/conf.d folder so nginx pull it from there because nginx have this line = include /etc/nginx/conf.d/*.conf;

BUT big problem is more_clear_headers.
My nginx did not recognize more_clear_headers i think i need to install this modeile but i don’t know hot to install that. Otherwise i can not success.

Could you expleain me should i activate Overwrite the cache-control header for WordPress’s pages using web server rules? and why i get error for my all artcile URLS (not for image ones) at https://cache-checker.com/
It says We couldn’t detect a caching mechanism on your website.

May be if i activate Overwrite the cache-control header for WordPress’s pages using web server rules it can be fixed.

Thanks for your helps

@isaumya

for example my url
https://wifisifrekirici.com/cmd/
https://imgur.com/dKzuQ2z

Date: Thu, 21 Oct 2021 18:03:55 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
vary: Accept-Encoding
x-pingback: https://wifisifrekirici.com/xmlrpc.php
link: <https://wifisifrekirici.com/wp-json/>; rel="https://api.w.org/"
cache-control: s-maxage=31536000, max-age=60
x-wp-cf-super-cache: cache
x-wp-cf-super-cache-active: 1
x-wp-cf-super-cache-cache-control: s-maxage=31536000, max-age=60
x-wp-cf-super-cache-cookies-bypass: swfpc-feature-not-enabled
x-fastcgi-cache: MISS
CF-Cache-Status: HIT
Age: 8286
Last-Modified: Thu, 21 Oct 2021 15:45:49 GMT
Expect-CT: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
Report-To: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=iG0M5S4TDnrx47XG71r2yw4f2XgmsQ4bXpbhch9ckY8MsZkyfEMspronC5DnExkOXe3wfAUTfLThQ7YdkkhD%2FOdqYx6PurjEpHzVCJSoMEx7Es3btmHK6Qc5aG27mtatuxCJGxDT"}],"group":"cf-nel","max_age":604800}
NEL: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
Server: cloudflare
CF-RAY: 6a1c67c6f80e4c86-AMS
alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400, h3-28=":443"; ma=86400, h3-27=":443"; ma=86400

Too bad!
We couldn’t detect a caching mechanism on your website.

for example another friends site
https://www.gulshankumar.net/install-wordpress-with-lemp-on-ubuntu-18-04/
https://imgur.com/vIuYHwB

Cache-Control: max-age=0, must-revalidate, no-cache, no-store
Content-Type: text/html; charset=UTF-8
Date: Thu, 21 Oct 2021 18:02:25 GMT
Display: pub_site_sol
Expires: Wed, 20 Oct 2021 18:02:25 GMT
Pagespeed: off
Response: 200
Server: nginx
Set-Cookie: ezoadgid_21206=-2; Path=/; Domain=gulshankumar.net; Expires=Thu, 21 Oct 2021 18:32:25 UTC
Strict-Transport-Security: max-age=15724800; includeSubDomains
Vary: Accept-Encoding
X-Ez-Minify-Html: 9.39% 250776 / 276764
X-Ez-Proxy-Out: true 2.3
X-Ezoic-Cdn: Hit ds;mm;4c5a64b9b143c4844678996add44fc31;2-21206-12;b03929d4-e990-4a93-5fd6-45e24a7d7cd4
X-Middleton-Display: pub_site_sol
X-Middleton-Response: 200
X-Origin-Cache-Control:
X-Sol: pub_site
X-Ua-Compatible: IE=edge

Passed test.

Why my urls take this warning
We couldn’t detect a caching mechanism

Thanks

You are the best. @isaumya
Before you helped me so much this time i will help you for your plugin 🙂
This problem is related with Overwrite the cache-control header for WordPress’s pages using web server rules!

If you want to enable this, you need to add below code

  more_clear_headers 'Pragma';
    more_clear_headers 'Expires';
    more_clear_headers 'Cache-Control';
    add_header Cache-Control $wp_cf_super_cache_active;

But when you add this nginx gives error because default nginx does not have more_clear_headers module!

I searched help topics and some of friends have this problem
https://wordpress.org/support/topic/how-to-overwrite-the-cache-control-header-on-nginx/
@ducod

https://wordpress.org/support/topic/how-to-do-the-nginx-conf-on-a-vps/
@yellofish

Here is the solunation:

sudo apt install nginx-extras

If you install this packet, 50-mod-http-headers-more-filter module adds to your nginx so without any error you can add more_clear_headers commands to your nginx conf file, and you can use Overwrite the cache-control header for WordPress’s pages using web server rules function!

Thank you