[TYPO3-core] RFC: more fixes for status=503

[Dmitry Dulepov]

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Hello!

This is a CVS patch request.

Branches: HEAD, TYPO3_4-0

Symptoms: HTTP status 503 is sent when plugin calls $TSFE->set_no_cache().

Problem: TSFE did not handle this case properly. Due to the nature of
the cache, temporary content always comes to the cache before page is
being actually generated. If set_no_cache is not called, this temporary
content is replaced with real content. If set_no_cache is called,
temporary content is left in the database and sent to client during
subsequent connections.

Solution: clear temporary content if no_cache is detected.

See: http://bugs.typo3.org/view.php?id=3049 and
http://bugs.typo3.org/view.php?id=3176

Note: commit is pending until merge is complete.

Dmitry.
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