Disable manualy persisting
HTTP says, no writing if GET.
But in Neos f.e. there are several places using hard/manualy persisting somewhere inside the job stack.
You can send f.e. a GET request to a NodeController wich moves an entity. The persistence is invoked manualy.
I dont want to worry about sending GET Requests to the server. I want to be sure "Okay, if you send GET, definitly NOTHING will happen to the system".
So imho $this-persistenceManager->persistAll() f.e. should not be possible in safe requests.
Strictly throw Exception.
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