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if request null redirect http referrer

Posted on 2011-03-13
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Last Modified: 2012-05-11
Hello, is this coded correctly /will it work --

(asp vb script)

thanks -

<% If Request("femail") NULL then Response.Redirect(Request.ServerVariables("HTTP_REFERER")) %>
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Question by:garethtnash
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by:
sammySeltzer earned 250 total points
ID: 35123315
Should be something like:

<% If Request("femail") ="" then Response.Redirect(Request.ServerVariables("HTTP_REFERER")) %> 

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by:Michel Plungjan
Michel Plungjan earned 125 total points
ID: 35123523
assuming they have been set
referrer is not set when you load a url from the location bar or from bookmark
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Expert Comment

by:sammySeltzer
ID: 35124286
good point
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Assisted Solution

by:neeraj523
neeraj523 earned 125 total points
ID: 35128083
Better to use it in this way


<%
If Request("femail") = "" Then
   If Request.ServerVariables("HTTP_REFERER") <> "" Then
     Response.Redirect(Request.ServerVariables("HTTP_REFERER"))
   Else
     Response.Write "Invalid access."
  End if
End if
%>
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by:sammySeltzer
sammySeltzer earned 250 total points
ID: 35128383
He could also user Server.Transfer.

It is actually safer.

One of my least favorites, an option nonetheless, is to use

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