clear preflight cache on IE?

Hi Experts,
Can anyone PLEASE tell me how to clear the preflight cache on IE?

Many thanks!
Mike
LVL 1
threadyAsked:
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Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
According to this page, it is only related to Cross-Origin Resource Sharing (CORS).  It also says it should be cleared when your regular cache is cleared and that the normal expiration is 30 minutes.

https://developers.google.com/storage/docs/cross-origin
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Dave BaldwinFixer of ProblemsCommented:
Never heard of "preflight cache".  You can clear the normal cache (which is the Temporary Files) in Internet Options on the General tab under Browser History.
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threadyAuthor Commented:
Preflight cache is a special cache for saving preflight requests.  See http://www.w3.org/TR/cors/
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threadyAuthor Commented:
Yes I'm doing preflight requests for CORS.  And the expiration we set was 20 days (it's an option that you can return along with the allow-origin flag).  The site says it "may" clear when you clear your browser cache.  And that's for chrome.  In IE, when you clear cache, you're given very specific items that get cleared and preflight results are not one of them..  It seems that this is definitely not cleared by IE when you clear normal cache...
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Dave BaldwinFixer of ProblemsCommented:
Does your version of IE (?) even support CORS?
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threadyAuthor Commented:
Yes, CORS is supported on IE 10 and 11...
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Dave BaldwinFixer of ProblemsCommented:
You're going to have to click on "Request Attention" above.  I don't know enough about this to help you.
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Rainer JeschorCommented:
Hi,
just a guess but have you tried the clear cache function from IE11 dev tools?
Have you unvhecked preserve favorites?
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threadyAuthor Commented:
Just tried removing everything but the kitchen sink.  No luck...
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threadyAuthor Commented:
Just clearing the browser cache is confirmed to work.  My problem was not because of the preflight cache.  It was just a red herring.
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