[Varnish] #225: VCL: Allow "Expires" time to be easily specified / calculated

[Varnish]

#225: VCL: Allow "Expires" time to be easily specified / calculated
-------------------------+--------------------------------------------------
 Reporter:  cyberduck    |       Owner:  phk  
     Type:  enhancement  |      Status:  new  
 Priority:  normal       |   Milestone:       
Component:  varnishd     |     Version:  trunk
 Severity:  normal       |    Keywords:       
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 In some situations it would make sense to alter or set an "Expires: "
 entry in the header to alter how browsers will cache objects.

 Currently this is not possible because there is no way of calculating
 Expires timestamps from VCL.

 A workaround that in limited testing seems to work (using C) is :
 C{
 #include <time.h>
   char l_str_buf[64];
   time_t l_expire = time(NULL)+(60*15); /* Expire after 15 minutes */
   size_t l_retval = strftime(l_str_buf, 64, "%a, %d %b %Y %H:%M:%S GMT",
 gmtime(&l_expire) );
   if (l_retval) {
     VRT_SetHdr(sp, HDR_OBJ, "\010Expires:", l_str_buf, 0);
   }
 }C

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Ticket URL: <http://varnish.projects.linpro.no/ticket/225>
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