def call(self, params):
        """
        Make an API call to the wiki. *params* is a dictionary of query string
        arguments. For example, to get basic information about the wiki, run:

        >>> wiki.call({'action': 'query', 'meta': 'siteinfo'})

        which would make a call to
        ``http://domain/w/api.php?action=query&meta=siteinfo&format=json``
        (except the query string would be sent in POST).

        :param params: dictionary of query string parameters
        :returns: dictionary containing API response
        """
        return json.loads(self._fetch_http(self._api_url, params))