def add_header(self, _name, _value, **_params):
        parts = []
        for k, v in _params.items():
            if v is None:
                parts.append(k.replace('_', '-'))
            else:
                parts.append(_formatparam(k.replace('_', '-'), v))
        if _value is not None:
            parts.insert(0, _value)
        self._headers.append((_name, SEMISPACE.join(parts)))
Convert this data source to pandas dataframe.
dataset/ETHPy150Open babble/babble/include/jython/Lib/email/message.py/Message.add_header--crossover with--dataset/ETHPy150Open bokeh/bokeh/bokeh/models/sources.py/ColumnDataSource.to_df