贴个详细的http头看看

这里是服务器的header：
HTTP/1.1 200 OK
Date: Sat, 19 Mar 2016 13:23:05 GMT
Content-Type: text/xml;charset=UTF-8
Content-Length: 85602
Connection: keep-alive
Server: Tengine
Access-Control-Allow-Origin: *
Access-Control-Max-Age: 86400
Content-Source: mc-cluster
Last-Modified: Sat, 19 Mar 2016 02:15:02 GMT
Content-Encoding: deflate
Expires: Sat, 19 Mar 2016 13:23:20 GMT
Cache-Control: max-age=15
X-Cache: REVALIDATED from cn2-zjwx-cmcc.hdslb.com
X-Cache-Lookup: HIT from mc-cluster