HttpContext.Request.UrlReferrer null when changing domain

Hi have a website that is host on 2 servers, on in Europe for the french version of the website (.fr) and the other in the Us for the other versions (.com). When I do a RedirectResult("http://domain.fr") from my .com website in a controller, my Referrer is null is it normal?

I think that I will have to post a querystring fr开发者_如何学JAVAom a domain to an other so I will be able to know when it's comming from this site.

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urlreferrer is collected from the client side browser

are you make sure that your test request site A from a link in Site B and not response.redirect