How do I redirect an http:// request to https://?

This should be placed at the top of any page that is accessible by http:// but that you want accessed only through https:// 
 

<%      if Request.ServerVariables("HTTPS") = "off" then          srvname = Request.ServerVariables("SERVER_NAME")          scrname = Request.ServerVariables("SCRIPT_NAME")          response.redirect("https://" & srvname & scrname)      end if        ' continue "secure" code here  %>

 
As Ray points out, though, this will not carry over values from the Request.Form and/or Request.QueryString collections. So, if a user had posted a form to the above page, or , the behavior would not be as expected, because the values would be lost. 
 
To solve this problem, we can add some logic: 
 

<%      if Request.ServerVariables("HTTPS") = "off" then          method = Request.ServerVariables("REQUEST_METHOD")          srvname = Request.ServerVariables("SERVER_NAME")          scrname = Request.ServerVariables("SCRIPT_NAME")          sRedirect = "https://" & srvname & scrname          sQString = Request.Querystring          if Len(sQString) > 0 Then sRedirect = sRedirect & "?" & sQString          if method = "POST" then              Response.Write "<form method=post action=" & _                  sRedirect & " name='f'>"              for x = 1 to Request.Form.Count()                  tname = Request.Form.Key(x)                  tvalue = Server.HTMLEncode(Request.Form.Item(x))                  Response.Write "<input type=hidden name=" & _                      tname & " value=""" & _                      tValue & """>" & vbCrLf              next              Response.Write "<input type=submit value=Go></form>"              Response.Write "<script>" & vbCrLf              Response.Write "document.f.submit();" & vbCrLf              Response.Write "</script>"          else              Response.Redirect sRedirect          end if      end if        ' continue "secure" code here  %>

 
(Sorry, William Tasso, but the post method here relies on client-side script, so won't work for you — you'll actually have to click on the Go button.)