regsub in error response

[Chris Hecker]

But the req.url doesn't seem to have the domain name in it, which is 
what I want to redirect...

Chris



On 2010/09/14 10:46, Caunter, Stefan wrote:
> You need to tell the browser the new location in vcl_error. I have
> something similar for mobile redirects.
>
> First in vcl_recv catch the event:
>
>    if( ... some condition ... ) {
>                          set req.url = regsub(req.url, "(.*)",
> "/mobile\1");
>                          error 750 "Moved Temporarily";
>                  }
>
> Then handle it in vcl_error:
>
> if (obj.status == 750) {
>                  set obj.http.Location = req.url;
>                  set obj.status = 302;
>                  return(deliver);
> }
>
> You can specify obj.status = 301 of course.
>
> Stefan Caunter :: Senior Systems Administrator :: TOPS
> e: scaunter at topscms.com  ::  m: (416) 561-4871
> www.thestar.com www.topscms.com
>
>
> -----Original Message-----
> From: varnish-misc-bounces at varnish-cache.org
> [mailto:varnish-misc-bounces at varnish-cache.org] On Behalf Of Michael
> Alger
> Sent: September-11-10 5:52 AM
> To: varnish-misc at varnish-cache.org
> Subject: Re: regsub in error response
>
> On Fri, Sep 10, 2010 at 10:12:59AM -0700, Chris Hecker wrote:
>>
>> I'd like to do a 301 from a.com to b.com, but preserving the whole
>> url,  but I can't figure out how to do it.  This doesn't work to
>> send it to  vcl_error:
>>
>>   error 751 regsub(req.url,"a.com","b.com");
>>
>> The regsub isn't allowed there.  Can I stuff it in a header that I
>> can  get in vcl_error?
>
> You probably can. What I do for redirects is to rewrite the req.url
> and then use that in the error statement, i.e.
>
>    set req.url = regsub (req.url, "rewritefrom", "rewriteto");
>    error 751 req.url;
>
> For your particular case where you don't actually want to rewrite
> the URL but instead only change the host part of it, I would do
> something like:
>
>    if (req.url ~ "(?i)^/vanitypath")
>    {
>      set req.url = "http://b.com" req.url;
>      error 751 req.url;
>    }
>
> Note that the host isn't present in req.url (use req.http.Host for
> that) - so in the first example, "rewriteto" should start with a
> full protocol specification (http://...").
>
> Most browsers work fine if they're told to redirect to /foo, but I
> don't really like relying on it.
>
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