Representational State Transfer (REST) is the protocol used to communicate with the APIC-EM server. Any programming language that supports HTTP/HTTPS calls can be used to make REST calls.
Hope you got the answer after referring the url - https://developer.cisco.com/fileMedia/download/7f047ce5-7bca-4c7d-9a44-a43273546217 . Request to refer the section Caveats and settings.
Refernce - https://communities.cisco.com/thread/47371
Thanks and Regards,