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Get the referer address using undocumented ServerVariables property

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Submitted on: 9/20/2002 2:22:04 PM
By: John Tolar 
Level: Beginner
User Rating: By 1 Users
Compatibility:ASP (Active Server Pages)

Users have accessed this article 839 times.
 
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     I don't know why this was not in the ServerVariables documentation. The Server Variables collection retrieves all HTTP header information in and places it in the ALL_HTTP Property of the Servervariables collection. It also creates individual properties prefaced with "HTTP_". This only works when the Referer header is sent. You must be directed to the page from another. This is also a good way to test and see if the user came directly to the page. If so the HTTP_Referer will be blank. By doing this anything found in the Request.Servervariables("ALL_HTTP") can be accessed by Request.Servervariables("HTTP_"). This includes the referer address since it is passed in the header packets.

 
 
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<%Response.Write Request.ServerVariables("HTTP_REFERER") & "
" 'List All Values that are retreieved fro ' m the header. For each x in Request.ServerVariables If Left(x, 5) = "HTTP_" then Response.Write x & " = " & Request.ServerVariables(x) & "
" End If Next %>


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9/22/2002 2:39:06 AM:Sam Moses
Glad someone else noticed this.
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