In XMLRPCServlet, if everything is OK a MIME type of
text/html is sent. I have used this for Python-to-Python
XML-RPC and it's fine.
However, it seems non-Pythonic clients often look for a
MIME type of text/xml and reject the text/html type.
For the time being I have changed the MIME type here to
text/xml and it works well for me.