def append(self, key: str, value: str) -> None:
        """
        Append a header, preserving any duplicate entries.
        """
        append_key = key.lower().encode("latin-1")
        append_value = value.encode("latin-1")
        self._list.append((append_key, append_value))
def append(self, key: str, value: str) -> None:
        """
        Append a header, preserving any duplicate entries.
        """
        append_key = key.lower().encode("latin-1")
        append_value = value.encode("latin-1")
        self._list.append((append_key, append_value))
def append ( self , key : str , value : str ) -> None : append_key = key . lower ( ) . encode ( "latin-1" ) append_value = value . encode ( "latin-1" ) self . _list . append ( ( append_key , append_value ) )
Append a header, preserving any duplicate entries.
Append a header preserving any duplicate entries .