Rollback to numerical HTTP code
see: https://github.com/symfony/symfony/pull/9808#issuecomment-30822615 (+1 squashed commit)
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[7566e01] Use self:: instead of static:: - and I should consider stopping writhing code at midnight after a long workday ;) (+1 squashed commit)
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[ea1e670] hasPreconditionFailed() and setPreconditionFailed()