asp获得完整的url

<%

Function GetUrl()
  Dim ScriptAddress,Servername,qs
  ScriptAddress = CStr(Request.ServerVariables("SCRIPT_NAME"))
  Servername = CStr(Request.ServerVariables("Server_Name"))
  qs=Request.QueryString
  if qs<>"" then
  GetUrl ="http://"& Servername & ScriptAddress &"?"&qs
  else
  GetUrl ="http://"& Servername & ScriptAddress
  end if
End Function


%>