A few internet references report that etags for the same underlying resource but with different representation (xml, json ...) should have different etags. That is currently not the case. Added code to allow incorporation of representation info into the etag. By default the representation is "json", but future patches can pass the representation down and modify flow to match requested representation.

try:
    # Python 3+.
    from xmlrpc import client, server
    server.SimpleXMLRPCDispatcher
except (ImportError, AttributeError):
    # Python 2.
    import xmlrpclib as client
    import SimpleXMLRPCServer as server