By providing a next method, the key object supports use as an iterator.
        For example, you can now say:

        for bytes in key:
            write bytes to a file or whatever

        All of the HTTP connection stuff is handled for you.

def next(self):
        """
        By providing a next method, the key object supports use as an iterator.
        For example, you can now say:

        for bytes in key:
            write bytes to a file or whatever

        All of the HTTP connection stuff is handled for you.
        """
        self.open_read()
        data = self.resp.read(self.BufferSize)
        if not data:
            self.close()
            raise StopIteration
        return data