Varnish sending 304 not modified - unwanted

[Shibashish]

Hi,

I have a site which has a FB login in it, login happens, but while logout,
varnish sends a 304 not modified, hence the page is not refreshed and
logout is not shown on the page. The cookies do get deleted as it should
happen. If i check from backend, everything seems ok. How can I rectify
this?

in vcl_recv....

 if (req.http.host ~ "^host.domain.com$" {
 return(pass); }


varnishlog...

  296 RxRequest    c GET
  296 RxURL        c /
  296 RxProtocol   c HTTP/1.1
  296 RxHeader     c Host: host.domain.com
  296 RxHeader     c User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64;
rv:12.0) Gecko/20100101 Firefox/12.0
  296 RxHeader     c Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
  296 RxHeader     c Accept-Language: en-us,en;q=0.5
  296 RxHeader     c Accept-Encoding: gzip, deflate
  296 RxHeader     c Connection: keep-alive
  296 RxHeader     c Referer: http://host.domain.com/
  296 RxHeader     c Cookie:
__utma=198839274.365445528.1337689518.1337689518.1337689518.1;
__utmb=198839274.5.10.1337689518; __utmc=198839274;
__utmz=198839274.1337689518.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none);
__qca=P0-1956808353-1337689518459; fbsr_2770104656637
  296 RxHeader     c If-Modified-Since: Tue, 22 May 2012 12:24:34 GMT
  296 VCL_call     c recv pass
  296 VCL_call     c hash hash
  296 VCL_call     c pass pass
  296 Backend      c 267 video video[0]
  296 TTL          c 313634256 RFC 60 1337689482 0 0 0 0
  296 VCL_call     c fetch
  296 TTL          c 313634256 VCL 30 1337689483
  296 VCL_return   c deliver
  296 ObjProtocol  c HTTP/1.1
  296 ObjStatus    c 200
  296 ObjResponse  c OK
  296 ObjHeader    c Date: Tue, 22 May 2012 12:24:42 GMT
  296 ObjHeader    c Last-Modified: Tue, 22 May 2012 12:23:12 GMT
  296 ObjHeader    c Vary: Cookie,Accept-Encoding
  296 ObjHeader    c X-Pingback: http://host.domain.com/xmlrpc.php
  296 ObjHeader    c Content-Encoding: gzip
  296 ObjHeader    c Content-Length: 18062
  296 ObjHeader    c Content-Type: text/html; charset=UTF-8
  296 ObjHeader    c Server: Web/10.1.10
  296 VCL_call     c deliver deliver
  296 TxProtocol   c HTTP/1.1
  296 TxStatus     c 304
  296 TxResponse   c Not Modified
  296 TxHeader     c Date: Tue, 22 May 2012 12:24:42 GMT
  296 TxHeader     c Last-Modified: Tue, 22 May 2012 12:23:12 GMT
  296 TxHeader     c Connection: keep-alive
  296 TxHeader     c X-Cache: MISS
  296 TxHeader     c Vary: Accept-Encoding
  296 TxHeader     c X-Country-Code: Unknown
  296 Length       c 0
  296 ReqEnd       c 313634256 1337689482.766963959 1337689482.779349089
0.051923990 0.012341022 0.000044107
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