IIS 301重定向与程序代码实现301重定向的差别

<?
Header( "HTTP/1.1 301 Moved Permanently" ) ;
Header( "Location: http://www.mydomain.com/" );
?>

<%@ Language=VBScript %>
<%
Response.Status="301 Moved Permanently"
Response.AddHeader "Location","http://www.mydomain.com/"
%>

<script runat="server">
private void Page_Load(object sender, System.EventArgs e)
{
Response.Status = "301 Moved Permanently";
Response.AddHeader ("Location","http://www.mydomain.com/");
}
</script>

<.cfheader statuscode="301" statustext="Moved permanently">
<.cfheader name="Location" value="http://www.mydomain.com/">