<div>
Never heard of &quot;preflight cache&quot;. &nbsp;You can clear the normal cache (which is the Temporary Files) in Internet Options on the General tab under Browser History.
</div>


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.

<div>
Preflight cache is a special cache for saving preflight requests. &nbsp;See <a href="http://www.w3.org/TR/cors/" rel="ugc">http://www.w3.org/TR/cors/</a>
</div>


Preflight cache is a special cache for saving preflight requests.  See http://www.w3.org/TR/cors/ [http://www.w3.org/TR/cors/]

<div>
Yes I'm doing preflight requests for CORS. &nbsp;And the expiration we set was 20 days (it's an option that you can return along with the allow-origin flag). &nbsp;The site says it &quot;may&quot; clear when you clear your browser cache. &nbsp;And that's for chrome. &nbsp;In IE, when you clear cache, you're given very specific items that get cleared and preflight results are not one of them.. &nbsp;It seems that this is definitely not cleared by IE when you clear normal cache...
</div>


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...

<div>
Does your version of IE (?) even support CORS?
</div>


Does your version of IE (?) even support CORS?

<div>
Yes, CORS is supported on IE 10 and 11...
</div>


Yes, CORS is supported on IE 10 and 11...

<div>
You're going to have to click on &quot;Request Attention&quot; above. &nbsp;I don't know enough about this to help you.
</div>


You're going to have to click on "Request Attention" above.  I don't know enough about this to help you.

<div>
Hi,<br />
just a guess but have you tried the clear cache function from IE11 dev tools?<br />
Have you unvhecked preserve favorites?
</div>


Hi,
just a guess but have you tried the clear cache function from IE11 dev tools?
Have you unvhecked preserve favorites?

<div>
Just tried removing everything but the kitchen sink. &nbsp;No luck...
</div>


Just tried removing everything but the kitchen sink.  No luck...

<div>
Just clearing the browser cache is confirmed to work. &nbsp;My problem was not because of the preflight cache. &nbsp;It was just a red herring.
</div>


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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<div class="content wysiwyg-content">
Hi Experts,<br />
Can anyone PLEASE tell me how to clear the preflight cache on IE?<br />
<br />
Many thanks!<br />
Mike
</div>
</div>


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

clear preflight cache on IE?

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