def add_header(self, name: str, value: _HeaderTypes) -> None:
        """Adds the given response header and value.

        Unlike `set_header`, `add_header` may be called multiple times
        to return multiple values for the same header.
        """
        self._headers.add(name, self._convert_header_value(value))
def add_header ( self , name : str , value : _HeaderTypes ) -> None : self . _headers . add ( name , self . _convert_header_value ( value ) )
Adds the given response header and value.

        Unlike `set_header`, `add_header` may be called multiple times
        to return multiple values for the same header.