URL is not getting cached as needed due to sudden changes in the value of age header

Website, Application, Performance
1

At my first request the headers are:

access-control-allow-origin: *
age:5580
alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400
cache-control:public, max-age=14400, proxy-revalidate
cf-cache-status:HIT

At second request I am getting age which is way low than previous:

access-control-allow-origin:*
age:1753
alt-svc:h3=":443"; ma=86400, h3-29=":443"; ma=86400
cache-control:public, max-age=14400, proxy-revalidate
cf-cache-status:HIT

At third request, getting different age:

access-control-allow-origin:*
age:1546
alt-svc:h3=":443"; ma=86400, h3-29=":443"; ma=86400
cache-control:public, max-age=14400, proxy-revalidate
cf-cache-status:HIT

Why is this happening? Because of this my cache is getting expired quickly. Sometimes when I request the age becomes value that closer to the max-age which was previou just 1000s.

2

Cache is set by the TTL. As the asset ages the time remaining before the asset needs to be revalidated decreases. The results here appear normal.

3

Even if it is lowering or getting increasing, it should be gradual right. The age:5580 changing to age:1753 in just less than a second. I try to request it multiple times in a 3-5 seconds, but the age difference is 1000s. Why is that? And my TTL is max-age: which is 14400. And only after that it should show a MISS, EXPIRED, right?

4

Do you have an example URL? The only answer that seems plausible at the moment is that you’re in a parallel universe where time runs differently.

5

Yes, First I thought it might be like that, check out this site (https://disposablepod.com) which uses Cloudflare. And in POSTMAN/some similar tool with GET Request, try it. Randomly hit some request, you could see the age is getting sometime 577 then 704, then 585, then 577 like that in a small timespan. Is this can occur because of Tiered cache?

6

The site appears to be using APO and the differing cache TTLs are likely due to different worker processes responding.

1 Like
7

Thanks for the info. For my site, I am not using WordPress. Maybe something I miss. Anyway congrats for your Aniverssary in this community.

1 Like
8

Glad we can assist.

Are you using a hosting service that may be on Cloudflare?

Checking the response headers APO is definitely active.

ex
ex1292×444 32.6 KB

Har available for a week: https://tempfile.io/en/cfBTsIupnug9R3V/file

9

Sorry for the confusion, that isn’t my website. similar to this site i get different values for age header when trying to load multiple times. for my site , it doesn’t use APO or wordpress. But i found similar issue with this site i have menstioned.

10

Thanks for the Clarification.

Can you provide the domain name on Cloudflare?

Can you capture a HAR file of the issue?

11

This is one another site, I found the same issue as mine, netsbot.com. I checked whether it is wordpress and it’s not.

12

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