'Get the file and parse it.
:param fuzzable_request: A fuzzable_request instance that contains
(among other things) the URL to test.'

@runonce(exc_class=RunOnce)
def crawl(self, fuzzable_request):

    base_url = fuzzable_request.get_url().base_url()
    url_generator = self._url_generator(base_url, self._extensions, self._wordlist)
    self.worker_pool.map(self._send_and_check, url_generator, chunksize=10)
