[TYPO3-mvc] f:form without cHash does only display same site

[Domi]

Ok found the problem with the Ajax call:
config.additionalHeaders = Content-type:application/json|Cache-Control: 
no-cache, must-revalidate, max-age=0|Pragma:no-cache
Without that the browser would always cache the content. 
config.no_cache=1 was not enough.
Thanks for reading,
Dominic