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

[Varnish]

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

Comment(by blakefrost):

 The original patch wasn't working for me because the modified files were
 being over written during the make install. I moved the changes to the
 source for the generated files. This patch should now apply cleanly and
 work as advertised.

 I would like to second askalski request for this patch to be incorporated.
 Exposing this variable allows for the important distinction between the
 initial request and esi requests. This is handy if you'd like to modify
 one or the other but not both. A pattern I follow is to return all
 dynamically generated content in the first response and esi blocks to fill
 in with static/shared/cached content. In order to enable cacheing for the
 esi parts cookies must be cleared prior to the esi request but not before
 the initial request. This is where req.esis comes in which makes it
 trivial to do so.

 I've include the vcl_recv and vcl_feth implementation I use to accomplish
 the above.

 {{{
 sub vcl_recv {
   if (req.esis > 0) {
     unset req.http.cookie;
   }
 }

 sub vcl_fetch {
   if (beresp.http.Content-Type ~ "text/html") {
     esi;
   }
 }
 }}}

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Ticket URL: <http://varnish-cache.org/trac/ticket/782#comment:2>
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