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: Backend response

[Per Buer]

Hi Alecs,

You can modify the object in vcl_fetch. See
http://varnish.projects.linpro.no/wiki/VCLExampleDefault for a flow
chart of VCL. Also read through "man vcl".

You can alter the headers in vcl_fetch before doing "deliver" on them
which will store the object and insert it into the cache.

Yes, it makes sense.

Per.


Alecs Henry wrote:
> Hi Per,
> 
> I'm looking into changing the headers all right! Where do I do that in VCL?
> I wanted to try to set some cache control headers before the object was
> put into varnish cache.
> 
> Does that even make sense?
> 
> Thanks!
> 
> Alecs
> 
> On Fri, Dec 12, 2008 at 7:20 PM, Per Buer  > wrote:
> 
> Alecs Henry wrote:
> > Hi!
> >
> > Is there a place where I can alter the backend response before it is
> > inserted into the cache?
> 
> You can remove, add and alter headers - but there isn't much you can do
> to the content. Except to ESI, process it, I guess.
> 
> 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: Backend response

[Alecs Henry]

Hi Per,

I'm looking into changing the headers all right! Where do I do that in VCL?
I wanted to try to set some cache control headers before the object was put
into varnish cache.

Does that even make sense?

Thanks!

Alecs

On Fri, Dec 12, 2008 at 7:20 PM, Per Buer  wrote:

> Alecs Henry wrote:
> > Hi!
> >
> > Is there a place where I can alter the backend response before it is
> > inserted into the cache?
>
> You can remove, add and alter headers - but there isn't much you can do
> to the content. Except to ESI, process it, I guess.
>
> Per.
>
> --
> http://linpro.no/ | http://redpill.se/
>
>
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Re: Varnishncsa

[Alecs Henry]

Thanks Dag, I must have missed it!

Alecs

On Fri, Dec 12, 2008 at 7:08 PM, Dag-Erling Smørgrav  wrote:

> "Alecs Henry"  writes:
> > What about cookies? Can varnish log cookie values? Or does it fit in
> > the same problem as the first message?
>
> Varnish can and does log cookies.  See the varnishlog(1) man page.
>
> DES
> --
> Dag-Erling Smørgrav - d...@des.no
>
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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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Re: Backend response

[Per Buer]

Alecs Henry wrote:
> Hi!
> 
> Is there a place where I can alter the backend response before it is
> inserted into the cache?

You can remove, add and alter headers - but there isn't much you can do
to the content. Except to ESI, process it, I guess.

Per.

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



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Re: Varnishncsa

[Dag-Erling Smørgrav]

"Alecs Henry"  writes:
> What about cookies? Can varnish log cookie values? Or does it fit in
> the same problem as the first message?

Varnish can and does log cookies.  See the varnishlog(1) man page.

DES
-- 
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Backend response

[Alecs Henry]

Hi!

Is there a place where I can alter the backend response before it is
inserted into the cache?

Thanks!

Alecs
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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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Re: Varnishncsa

[Alecs Henry]

I wish I was a developer.. That would make my life so much easier!

What about cookies? Can varnish log cookie values? Or does it fit in the
same problem as the first message?

Thanks!

Alecs

On Thu, Dec 11, 2008 at 8:34 PM, Dag-Erling Smørgrav  wrote:

> "Alecs Henry"  writes:
> > Is there any way to tweak the varnishncsa log?
>
> Not currently.  Patches are welcome.
>
> DES
> --
> Dag-Erling Smørgrav - d...@des.no
>
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Web GUI for varnish

[Petter Knudsen]

As an early christmas gift, here is a snapshot of the web GUI being 
developed for the 2.1 release: 
http://varnish.projects.linpro.no/wiki/WebGui

It is not 100% finished (saving state and security being the major 
issues and the code needs some cleaning), but I hope people can test and 
play with it and give some input to the final version due in february. 
You MUST read the README file before using it, as it will describe it all.

WARNING: This is, as mentioned, not finished, so don't use it on 
anything critical, as the VCL and parameters might be overwritten 
without warning.

Petter, ready for the holidays

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