Re: What to do when the backend sends no caching information?

[Per Buer]

Hi,

If you have a look at the default VCL you'll see that varnish does a
pass when the object is not cacheable (see man vcl again) or if it Sets
a cookie. I think you have to override this manually, both in vcl_fetch
and in vcl_recv.

Per.

Alecs Henry wrote:
> Hi Per,
> 
> I'm actually using the cookies in the cache (using the information
> provided on the website -- set req.hash += req.http.cookie;) and it
> works just fine!
> One thing that the backend does is vary on user-agent, not only
> content-encoding (I've removed the UA vary on the response, though).
> 
> So looking into varnishlog I can see the pass, even after the hash is
> shown correctly.
> 
> Any pointers?
> 
> THanks!
> 
> Alecs
> 
> On Fri, Dec 12, 2008 at 7:21 PM, Per Buer  > wrote:
> 
> Hi,
> 
> Alecs Henry wrote:
> >
> > Well, turns out varnish may be setting the ttl all right (I do it in
> > vcl_fetch, but frankly there really is no way to see if it is set
> > correctly or not! or is there?) but the page always gets a PASS,
> never a
> > HIT. Age: is set to 0 by varnish.
> 
> The client probably sends a cookie. When varnish sees a cookie it does a
> pass. Please see the FAQ on notes on how to deal with this.
> 
> Per.
> 
> --
> http://linpro.no/ | http://redpill.se/
> 
> 


-- 
Per Buer - Leder Infrastruktur og Drift - Redpill Linpro
Telefon: 21 54 41 21 - Mobil: 958 39 117
http://linpro.no/ | http://redpill.se/



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Re: What to do when the backend sends no caching information?

[Alecs Henry]

Hi Per,

I'm actually using the cookies in the cache (using the information provided
on the website -- set req.hash += req.http.cookie;) and it works just fine!
One thing that the backend does is vary on user-agent, not only
content-encoding (I've removed the UA vary on the response, though).

So looking into varnishlog I can see the pass, even after the hash is shown
correctly.

Any pointers?

THanks!

Alecs

On Fri, Dec 12, 2008 at 7:21 PM, Per Buer  wrote:

> Hi,
>
> Alecs Henry wrote:
> >
> > Well, turns out varnish may be setting the ttl all right (I do it in
> > vcl_fetch, but frankly there really is no way to see if it is set
> > correctly or not! or is there?) but the page always gets a PASS, never a
> > HIT. Age: is set to 0 by varnish.
>
> The client probably sends a cookie. When varnish sees a cookie it does a
> pass. Please see the FAQ on notes on how to deal with this.
>
> Per.
>
> --
> http://linpro.no/ | http://redpill.se/
>
>
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Re: What to do when the backend sends no caching information?

[Per Buer]

Hi,

Alecs Henry wrote:
>
> Well, turns out varnish may be setting the ttl all right (I do it in
> vcl_fetch, but frankly there really is no way to see if it is set
> correctly or not! or is there?) but the page always gets a PASS, never a
> HIT. Age: is set to 0 by varnish.

The client probably sends a cookie. When varnish sees a cookie it does a
pass. Please see the FAQ on notes on how to deal with this.

Per.

-- 
http://linpro.no/ | http://redpill.se/



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What to do when the backend sends no caching information?

[Alecs Henry]

Hi All,

In testing varnish in different situations, I came accross a backend that
sends no caching information in its responses, no Expires, cache-control or
anything.
Ok, I thought, I'll just set the TTL on that object (namely an html page) in
VCL.
Well, turns out varnish may be setting the ttl all right (I do it in
vcl_fetch, but frankly there really is no way to see if it is set correctly
or not! or is there?) but the page always gets a PASS, never a HIT. Age: is
set to 0 by varnish.

Thanks for all the help!

Alecs
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