(self)
return [k for k, v in self._headers]
Return a list of all the header field names.

        These will be sorted in the order they appeared in the original header
        list, or were added to this instance, and may contain duplicates.
        Any fields deleted and re-inserted are always appended to the header
        list.
Return a list of all the header field names.
Return a list of all the header field names .
def keys(self):
        """Return a list of all the header field names.

        These will be sorted in the order they appeared in the original header
        list, or were added to this instance, and may contain duplicates.
        Any fields deleted and re-inserted are always appended to the header
        list.
        """
        return [k for k, v in self._headers]
def keys ( self ) : return [ k for k , v in self . _headers ]