When using the Rest Api of Magento with a POST request and you get following error: "Invalid data type. Check Content-Type." you must read my blogpost further because I know the answer :)
The source of this error is in app/code/core/Mage/Api2/Model/Request/Interpreter/Query ...
Often errors in magento are very cryptic - when also googling doesn't solve problem it can get time-consuming. That's why I post here my errors I encountered and where I haven't found anything on the net.
Fatal error ...
If you want to check your magento installation whether it was affected by the XXE injection inside XMLRPC API I will show you my short pythonscript for it. For that you'll need Python/Requests. And the following script which you might need to configure for your installation:
import requests ...
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