Question
What is wrong with Request.ServerVariables("HTTP_REFERER")?
Answers
The situations where this servervariable works include the following methods of a browser loading a URL:
n A straight HTML
n A form submit (POST or GET) using a submit button or
n A form submit (POST or GET) using JavaScript
The situations where it doesn't work:
n A link from Favorites
n A click on 'Home' or a Link with a defined URL
n A JavaScript location.href or location.replace()
n A page linked from HierMenus (details)
n Typing the URL directly in the browser
n Launching a clickable URL from an e-mail or Word document
n Using Response.Redirect / Server.Transfer
n Using Response.AddHeader or to redirect
n Loading the URL with XML (see Article #2173)
Obviously, this variable cannot be relied upon for many situations.
Here is the code I used to test with. Ref.asp contains the following code:
<%
response.write "Referer: " & request.servervariables("http_referer")
%>
And ref.htm contains the following:
<%
Response.AddHeader "Refresh", "10;URL=ref.asp"
' interchanged with the version:
%>
http-equiv='refresh'
content='10;URL=ref.asp'>








href='ref.asp'>Go

there - straight link


href='#'
onclick='window.location.href="ref.asp";return false;'>Go
there - javascript href


href='#'
onclick='window.location.replace("ref.asp");return false;'>Go
there - javascript replace


href='#'
onclick='document.getform.submit();return false;'>Go
there - javascript GET


href='#'
onclick='document.postform.submit();return false;'>Go
there - javascript POST
You'll notice that in Netscape 4, the referer is translated properly in all cases. With this exception, I think we're all
glad, overall, that the number of users with Netscape 4 is quickly diminishing! :-)
  Your Comment




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