[TYPO3-core] RFC #17167: Cache ExtDirect::getAPI calls

[Steffen Gebert]

> Bugtracker reference:
> http://bugs.typo3.org/view.php?id=17167
>
> Branches:
> trunk
 >
> Solution:
> * Send correct headers
> * Add version number to API-inclusion-URLs, in case of we have updates

Committed to trunk rev. 10185

Follow-up for workspaces will be created.

Kind regards
Steffen

-- 
Steffen Gebert
TYPO3 Core Team Member

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