Request. ServerVariables (EnvironmentVariable)
The ServerVariables collection property contains, and allows you to retrieve, the values of server environment variables.
You can iterate through a collection using a For Each item in ... Next loop.
There is one mandatory argument.
EnvironmentVariable
-- HTTP_REFERER returns a string containing the original URL when a redirect has occurred.
client side javascript
referrer Property
If a destination document is reached by a user clicking on a Link object in another document (the referrer), this property returns the referring document's URL.
Syntax: document.referrer