cache-control header in request dropped by varnish

[Shiva]

Hi,
We use varnish v3.0.4 , we are seeing this issue where clients are sending
cache-control request header to varnish, but it is getting dropped before
sending to backend app.

I could see varnish receiving the header, also could see RxHeader having
cache-control header from varnishlog. Our backend server is on tomcat, in
tomcat access log the cache-control header is not seen.

Is this an expected behavior ? RFC spec on cache-control header seem to
mandate all caches to pass the header to the backend.

Thanks!
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