'Delete a header for this response.
If the header was not previously set, do nothing.
Args:
name (str): Header name (case-insensitive).  Must be of type
``str`` or ``StringType`` and contain only US-ASCII characters.
Under Python 2.x, the ``unicode`` type is also accepted,
although such strings are also limited to US-ASCII.'

def delete_header(self, name):

    self._headers.pop(name.lower(), None)
