兼容

<!-- 如果檢測到是http頁面，則自動跳轉到對應的https頁面 -->
<script type="text/javascript">
if (document.location.protocol != "https:") { 
  location.href = location.href.replace(/^http:/,"https:");
}
</script>

ASP

<%
If Request.ServerVariables("SERVER_PORT")=80 Then
Dim strSecureURL
strSecureURL = "https://"
strSecureURL = strSecureURL & Request.ServerVariables("SERVER_NAME")
strSecureURL = strSecureURL & Request.ServerVariables("URL")
Response.Redirect strSecureURL
End If
%>

PHP

if(!isset($_SERVER['HTTPS'])||!$_SERVER['HTTPS']){
   $url ='https://'. $_SERVER['HTTP_HOST']. $_SERVER['REQUEST_URI'];
   header('Location: '. $url);exit;
}