Question on Age header - a bit of help if anyone could spare the time

[p83822]

Got a third party who return headers like this (for 3 requests):

Cache-Control: public, no-transform, max-age=600
Expires: Mon, 20 Feb 2012 11:06:02 GMT
Date: Mon, 20 Feb 2012 10:56:02 GMT
Age: 7596

...

Cache-Control: public, no-transform, max-age=600
Expires: Mon, 20 Feb 2012 11:06:02 GMT
Date: Mon, 20 Feb 2012 10:56:02 GMT
Age: 7600

...

Cache-Control: public, no-transform, max-age=600
Expires: Mon, 20 Feb 2012 11:06:02 GMT
Date: Mon, 20 Feb 2012 10:56:02 GMT
Age: 7678

...

i.e. the Age header just keeps on going up.

I had kinda assumed that the Age ought to increment up to 600 (599?) and then start all over again with new Date and Expires values.

I want to get my facts straight before contacting the chaps about serving expired resources.

Much obliged.

N

[laurabat]

(02-20-2012 11:14 PM)p83822 Wrote:  Got a third party who return headers like this (for 3 requests):

Cache-Control: public, no-transform, max-age=600
Expires: Mon, 20 Feb 2012 11:06:02 GMT
Date: Mon, 20 Feb 2012 10:56:02 GMT
Age: 7596

...

Cache-Control: public, no-transform, max-age=600
Expires: Mon, 20 Feb 2012 11:06:02 GMT
Date: Mon, 20 Feb 2012 10:56:02 GMT
Age: 7600

...

Cache-Control: public, no-transform, max-age=600
Expires: Mon, 20 Feb 2012 11:06:02 GMT
Date: Mon, 20 Feb 2012 10:56:02 GMT
Age: 7678

...

i.e. the Age header just keeps on going up.

I had kinda assumed that the Age ought to increment up to 600 (599?) This is an excellent site I love it and then start all over again with new Date and Expires values.

I want to get my facts straight before contacting the chaps about serving expired resources.

Much obliged.

N

I have no idea about age header! I too would like to know the answer!

[p83822]

Looks like we have a guffed Proxy server someone in the route which adds the Age header.

The response from 'them' (from their caching layer) has a decrementing max-age and, when it get's to 0, a fresh response is served (new Date and Expires headers) with a full max-age.

Looks like I put this on the wrong thread and, arguably on the wrong forum. Apologies for this. I so regularly scramble my head with caching and it's permutations and I know that users of this site know this stuff inside out.

BR

Neil

[pmeenan]

I think you had a good place for the question just stumped all of us since what you were seeing didn't make any sense :-)