Follow up from https://bugs.freedesktop.org/show_bug.cgi?id=69405
The SoapAction header filed is missing in CMIS SOAP Request
Soap 1.1 requires the SOAPAction Header see:
http://www.w3.org/TR/2000/NOTE-SOAP-20000508/#_Toc478383528
The fix is simple. Just add
SOAPAction: ""
to the header fields