issue2550749 - the xmlrpc interface is invoked on content type and not url path. Sending any text/xml data to roundup results in invoking the xml-rpc interface, but a REST or other interface could also consume xml data and do something different. So require the use of 'http(s)://.../xmlrpc' uri to trigger the xmlrpc interface.

#!/usr/bin/env python
import zlib, base64, sys
print base64.encodestring(zlib.compress(sys.stdin.read()))