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I have two website
1) Main website: it has a link Help & Training that redirects user to another Help website.
2) Help website has no authentication rules thus anybody can visit the website directly.
Now I have a requirement to allow second website to be visited from first website’s link, all the other request should be redirect to another page.
Offcourse querystring/parameter validation is not acceptable as that can be visible and constant
Is it possible, any suggestion is appreciated.
You can use http://msdn.microsoft.com/en-us/library/system.web.httprequest.urlreferrer.aspx which is just an ASP.NET wrapper around the HTTP referrer header. http://en.wikipedia.org/wiki/HTTP_referrer
This, of course, can be spoofed so don’t rely on it for creating something super secure.