def __init__(self, url=None, nsdict=None, contextFactory=None, <EOL>tracefile=None, **kw):
self.url = url<EOL>self.nsdict = nsdict or {}<EOL>self.contextFactory = contextFactory<EOL>self.http_headers  = {'<STR_LIT>': '<STR_LIT>',}<EOL>self.trace = tracefile<EOL>
Initialize.
        Keyword arguments include:
            url -- URL of resource, POST is path 
            nsdict -- namespace entries to add
            contextFactory -- security contexts
            tracefile -- file to dump packet traces