multiple domains -> varnish -> one backend

[Jon Drukman]

Jon Drukman wrote:
> Poul-Henning Kamp wrote:
>>> 1.1.2
>> Please update to 1.2 or even better: -trunk, this has been fixed
>> in the meantime.
> 
> I am running trunk now and the behavior is the same.

i suspect what is going on is that i am changing req.http.host here:

> sub vcl_recv {
>      set req.url = regsub(req.url, "^", "/site");
>      set req.http.X-Orig-Host = req.http.host;
>      set req.http.host = "originserver.com";
> 
>      if (req.request == "POST") {
>          pipe;
>      }
> 
>      # force lookup even when cookies are present
>      if (req.request == "GET" && req.http.cookie) {
>          lookup;
>      }
> }

and thus varnish is using that as the hash key.  this would explain why 
the first requested domain is used for all subsequent cached replies. is 
there a way to 'save' the original req.http.host and use that as the 
hash key?  i tried to mess with req.hash in vcl_recv but varnish says 
i'm not allowed to tinker with those variables there.

-jsd-