Has anyone noticed this error message "Content-Type header is empty" when POST-ing to Magento REST API? I'm using Postman for testing and very-very surely I'm sending the Content-Type header along with my request. So something cuts it off in between. Can it be misconfigured Apache / .htaccess? Never seen that problem with nginx before.
The error is thrown by Mage_Api2_Model_Request, in the very early stage of API request.