用ASP检测网站地址是否有效

以下代码是用用ASP检测网站地址是否有效

<%
response.write "检测网站地址是否有效<br>"
on error resume next
set xml=Server.createobject("Microsoft.XMLHTTP")
xml.open "get","http://www.auuo.com/logo.gif",false '要检测的远程网站文件
xml.send
ints=xml.status
strs=xml.statustext
if isnumeric(ints) then
   if ints=12007 or  strs="Unknown" then
     response.write "网站地址出错<br>"
   end if
    if ints=404  then
     response.write "找不到网站文件<br>"
    else
    response.write "网站文件正确<br>"
    end if
end if
if response.buffer then
response.flush
end if
%>