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on line 765 of client/http.py, the client loops over the read method, sending it's content to the web server. It appears as though the send method should return at this point; instead it falls through and attempts to send the data object through first self.sock.sendall, falling back to the iterable interface.
The result is that a readable data object must support a null __iter__ method, or if it supports both a working read and __iter__, the data will be sent to the server twice.
Change the break on line 768 to a return, and the expected behavior happens.