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This property determines whether no-cache is enabled.
Setting this property to true forces any intervening proxy server
to re-request the page.
For the MSHTML engine, setting this
property to true sets INTERNET_FLAG_PRAGMA_NOCACHE. WinINET will
add request header Pragma: no-cache if going
through a HTTP/1.0 proxy and request header
Cache-Control: no-cache if going through a
HTTP/1.1 proxy.
For the Gecko engine, setting this
property to true sets the following flags.
- LOAD_FLAGS_IS_REFRESH — the load should have the
semantics of an HTML Meta-refresh tag (i.e., that the cache
should be bypassed).
- LOAD_FLAGS_BYPASS_HISTORY — history should not be updated.
- LOAD_FLAGS_BYPASS_CACHE — the local web cache should be
bypassed (but an intermediate proxy cache could still be used
to satisfy the load).
- LOAD_FLAGS_BYPASS_PROXY — any intermediate proxy caches
should be bypassed (i.e., that the content should be loaded from
the origin server).
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