[Varnish] #907: Varnish alternates between 200 and 304 responses with ETags

[Varnish]

#907: Varnish alternates between 200 and 304 responses with ETags
-------------------+--------------------------------------------------------
 Reporter:  lrowe  |        Type:  defect  
   Status:  new    |    Priority:  normal  
Milestone:         |   Component:  varnishd
  Version:  2.1.5  |    Severity:  normal  
 Keywords:         |  
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 I'm using Varnish 2.1.5 with a backend that produces ETags. This almost
 works fine, except I see page loads alternating between 304 Not Modified
 and 200 OK responses. This seems to be due to the 304 Not Modified
 response inserting a Last-Modified header in the response. On the next
 page load this causes the browser to send an If-Modified-Since header in
 addition to the If-None-Match header. Varnish then responds with a 200 OK
 rather then a 304 Not Modified.

 VCL:
 {{{
 backend backend_0 { .host = "127.0.0.1"; .port = "8080"; }
 }}}

 When I add the following VCL to remove the If-Modified-Since header, I
 always get a 304 Not Modified response:
 {{{

 sub vcl_recv {
     if (req.http.If-None-Match) {
         remove req.http.If-Modified-Since;
     }
 }
 }}}

-- 
Ticket URL: <http://varnish-cache.org/trac/ticket/907>
Varnish <http://varnish-cache.org/>
The Varnish HTTP Accelerator