擅长:python、mysql、java
<p>将服务器配置为提供<a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.29" rel="nofollow noreferrer">Last-Modified</a>头,并在请求中使用<a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.25" rel="nofollow noreferrer">If-Modified-Since</a>。你知道吗</p>