[Varnish] #782: expose sp->esis to vcl (patch attached)

[Varnish]

#782: expose sp->esis to vcl (patch attached)
----------------------+-----------------------------------------------------
 Reporter:  askalski  |        Type:  enhancement
   Status:  new       |    Priority:  normal     
Milestone:            |   Component:  build      
  Version:  trunk     |    Severity:  normal     
 Keywords:  esi       |  
----------------------+-----------------------------------------------------
 (See ticket #705.)

 I need to determine in VCL, whether or not a request is an ESI subrequest.
 The proposed workaround from ticket #705 (req.restarts) doesn't actually
 work (it's always 0, even for ESI subrequests.

 The concrete problem I'm trying to solve:  Strip cookies only for ESI
 subrequests, for two reasons: (a) to make them cacheable; (b) to address
 the security issue of cookies leaking between domains.  (Example:
 <esi:include src="http://some.other.domain.com/uri" />; the Cookie header
 from the orginal request gets sent to "some.other.domain.com".)

 {{{
 sub vcl_recv {
     if (req.esis > 0) {
         remove req.http.Cookie;
         remove req.http.Authorization;
     }
 }

 sub vcl_fetch {
     if (req.esis > 0) {
         remove beresp.http.Set-Cookie;
     }
 }
 }}}

 I attached a diff against 2.1.3 that adds a read-only "req.esis" keyword
 that returns the value of sp->esis.

 (req.esis is probably not the best name choice, because it will be
 confused easily with req.esi; feel free to change it.)

-- 
Ticket URL: <http://www.varnish-cache.org/trac/ticket/782>
Varnish <http://varnish-cache.org/>
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