* HTTPTestUtil.py: (SingleOnlyRangeRequestHandler): Noisily refuses mutliple range requests.
* test_http.py: (TestSingleOnlyRangeRequestServer): Test the retry mechanism when a server refuses to handle a mutiple range request without silently replying with a single range or full file response.
* _pycurl.py: (PyCurlTransport._get_ranged): The header have been built taken into account the range hint, don't rebuilt it *ignoring* that hint.