Returns the reponse MIME type for this view.

        :raises: :class:`pyramid.httpexceptions.HTTPNotAcceptable` if the
          MIME content type(s) the client specified can not be handled by
          the view.

def _get_response_mime_type(self):
        """
        Returns the reponse MIME type for this view.

        :raises: :class:`pyramid.httpexceptions.HTTPNotAcceptable` if the
          MIME content type(s) the client specified can not be handled by
          the view.
        """
        view_name = self.request.view_name
        if view_name != '':
            mime_type = get_registered_mime_type_for_name(view_name)
        else:
            mime_type = None
            acc = None
            for acc in self.request.accept:
                if acc == '*/*':
                    # The client does not care; use the default.
                    mime_type = self.__get_default_response_mime_type()
                    break
                try:
                    mime_type = \
                            get_registered_mime_type_for_string(acc.lower())
                except KeyError:
                    pass
                else:
                    break
            if mime_type is None:
                if not acc is None:
                    # The client specified a MIME type we can not handle; this
                    # is a 406 exception. We supply allowed MIME content
                    # types in the body of the response.
                    headers = \
                        [('Location', self.request.path_url),
                         ('Content-Type', TextPlainMime.mime_type_string),
                         ]
                    mime_strings = get_registered_mime_strings()
                    exc = HTTPNotAcceptable('Requested MIME content type(s) '
                                            'not acceptable.',
                                            body=','.join(mime_strings),
                                            headers=headers)
                    raise exc
                mime_type = self.__get_default_response_mime_type()
        return mime_type