'Check the URL query string.
:return: A list of mutants.'

def _generate_qs(self, fuzzable_request):

    query_string = fuzzable_request.get_uri().querystring
    for token in query_string.iter_tokens():
        wordnet_results = self._search_wn(token.get_value())
        mutants = QSMutant.create_mutants(fuzzable_request, wordnet_results, [token.get_name()], False, {})
        for mutant in mutants:
            (yield mutant)
