how can I make varnish to just cache but don't deliver?

[Pahud]

OK I think this is because 'error' is not allowed in vcl_deliver.  After
some google I found this guy had the same problem with me in 2008.
http://www.mail-archive.com/varnish-dev@projects.linpro.no/msg00372.html

<http://www.mail-archive.com/varnish-dev@projects.linpro.no/msg00372.html>But
this thread ended up with no solution.

Please help.

pahud

On Tue, Jul 6, 2010 at 6:23 PM, Pahud <pahudnet at gmail.com> wrote:

> I tried varnishd (varnish-2.1.2 SVN 4769:4772) on Gentoo Linux today. And
> the VCL compilation failed:
>
> Message from VCC-compiler:
> Variable 'obj.http.X-Cache-Only' not accessible in method 'vcl_fetch'.
> At: (input Line 106 Pos 21)
>                 set obj.http.X-Cache-Only = "true";
> --------------------#####################----------
> Running VCC-compiler failed, exit 1
> VCL compilation failed
>
> I also tried
> set resp.http.X-Cache-Only = "true";
> but still failed.
>
> :(
>
> pahud
>
>
> On Mon, Jul 5, 2010 at 10:49 PM, Pahud <pahudnet at gmail.com> wrote:
>
>> Thanks for your quick reply. I tried your config and varnish started with
>> no error but if I send http request in this case, varnish will have empty
>> response. And if I comment off the vcl_deliver it responds as normal.  Can
>> you help me a little bit more? Thanks again.
>>
>> pahud
>>
>>
>>
>>
>>
>>
>> On Mon, Jul 5, 2010 at 10:11 PM, Kristian Lyngstøl <
>> kristian at varnish-software.com> wrote:
>>
>>> On Mon, Jul 5, 2010 at 3:17 PM, Pahud <pahudnet at gmail.com> wrote:
>>> > vcl_deliver(). So I tried this configuration
>>> > sub vcl_deliver {
>>> >          if (req.http.Cache-Control ~ "just-cache") {
>>> >                error 200 "Cached";
>>> >                return (pass);
>>>
>>> return (pass); doesn't work from vcl_deliver, nor is it needed after
>>> an error-statement.
>>>
>>> >          }
>>> >     return (deliver);
>>> > }
>>> > But no good luck. I guess vcl_deliver just can't get the value of
>>> >  req.http.Cache-Control.
>>> > Is it still possible to achieve this just with VCL?
>>>
>>> Hmm. What you could do is:
>>>
>>> In vcl_fetch: if (req.http.Cache-Control ~ "just-cache") { set
>>> obj.http.X-Cache-Only = "true"; }
>>> In vcl_deliver:
>>>
>>> if (resp.http.X-Cache-Only == "true") {
>>>    if (obj.hits == 0) {
>>>        error 795 "Cached";
>>>    } else {
>>>        remove resp.http.X-Cache-Only;
>>>    }
>>> }
>>>
>>> I used the error code 795 to differentiate from 200, so you can catch
>>> it in vcl_error and strip most of the content of the error message if
>>> you want to. You may use whatever error code you want, of course.
>>>
>>> (I haven't tested this, but I don't see why it shouldn't work, except
>>> perhaps syntax typos).
>>>
>>> - Kristian
>>>
>>
>>
>
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