http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9.1
private:
Indicates that all or part of the
response message is intended for a
single user and MUST NOT be cached by
a shared cache. This allows an origin
server to state that the specified
parts of the response are intended for
only one user and are not a valid
response for requests by other users.
A private (non-shared) cache MAY cache
the response. Note: This usage of the
word private only controls where the
response may be cached, and cannot
ensure the privacy of the message
content.
注意，该header仅对代理(proxy server)有效，对浏览器而言只有一个用户
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