This property determines whether resync is enabled.
When a page is resynchronized, the server is requested to send
the new version of the page on the condition that the page in the
engine's cache is stale.
Setting this property to true sets INTERNET_FLAG_RESYNCHRONIZE.
WinINET will send an If-Modified-Since or If-None-Match request
header to allow a 304 response, and it may add a request
header, as UseNoCache does, to help
ensure that an intermediary (proxy) does not return a previously