http的返回的消息头问题
VC中用socket返回的消息头中没有If-Modified-Since和Etag信息怎么办
怎么检测该网页是否是否更新
www.163.com返回的消息头:
HTTP/1.0 200 OK
Server: nginx
Date: Sat, 05 Jun 2010 16:03:19 GMT
Content-Type: text/html; charset=GBK
Vary: Accept-Encoding
Expires: Sat, 05 Jun 2010 16:04:39 GMT
Cache-Control: max-age=80
Vary: User-Agent
Vary: Accept
X-Cache: MISS from cache.163.com
Via: 1.0 cache.163.com (squid/3.0.STABLE13)
Connection: close
本人是这方面的菜鸟,谁懂的告诉下谢谢!