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    <p>If it's only for this scenario (where you programatically redirect to B.aspx) then why not put something on the querystring to say where the redirect came from. This would be more likely to work across muliple browser types and devices.</p> <p>One advantage to this approach is that you'll be able to tell the difference between a redirect to B.aspx and a direct link (either via a link on one of your pages, or from the user entering the URL into the address base) to page B.aspx.</p> <p>The referrer is something the the client provides as part of the HTTP request. As such, you can't rely on it. </p> <p>By the way, this question is related: <a href="https://stackoverflow.com/questions/149130/request-urlreferrer-null">Request.UrlReferrer null?</a></p> <p><strong>Update</strong> Given your comments it's not clear that's an easy solution other than "edit all your files". I suspect that global search/replace might be your best bet.</p> <p>Some more background: If you use Fiddler (or any other http debugging tool) you should be able to see that the Referrer header isn't being populated when you perform a redirect. For example, this is the result of a redirect (i.e. an HTTP 302 response causing IE to redirect to another page):</p> <pre><code>GET /webapplication1/WebForm3.aspx HTTP/1.1 Accept: image/gif, image/jpeg, image/pjpeg, application/x-ms-application, application/vnd.ms-xpsdocument, application/xaml+xml, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, */* Accept-Language: en-GB User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; WOW64; Trident/4.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; InfoPath.2; .NET CLR 3.5.21022; .NET CLR 3.5.30729; .NET CLR 3.0.30618; MS-RTC LM 8; Zune 3.0) Accept-Encoding: gzip, deflate Connection: Keep-Alive Host: (removed) </code></pre> <p>Here is the HTTP request that is generated by clicking the "Questions" link on StackOverflow.com:</p> <pre><code>GET /questions HTTP/1.1 Accept: image/gif, image/jpeg, image/pjpeg, application/x-ms-application, application/vnd.ms-xpsdocument, application/xaml+xml, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, */* Referer: https://stackoverflow.com/questions/772780/finding-previous-page-url Accept-Language: en-GB User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; WOW64; Trident/4.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; InfoPath.2; .NET CLR 3.5.21022; .NET CLR 3.5.30729; .NET CLR 3.0.30618; MS-RTC LM 8; Zune 3.0) Accept-Encoding: gzip, deflate Host: stackoverflow.com Connection: Keep-Alive </code></pre> <p>You can see that the later, generated by a link on a page, generates the Referer header. </p>
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    1. COi am sorry but i could not find this thread thanks for your answer but the think is i will have to edit 50,000 pages so i am trying to find the logic to put it on my custom error page so that i can come to know which page has a broken url
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    2. COIn which case I think you probably need to code defensively on that page and realise that you won't always get this information. Sorry.
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