'Get all img tags and retrieve the src.
:param fuzzable_request: The request to modify
:return: A list with tuples containing (img_src, image_hash, http_response)'

def _get_images(self, fuzzable_request):

    res = []
    try:
        response = self._uri_opener.GET(fuzzable_request.get_uri(), cache=False)
    except:
        om.out.debug('Failed    to    retrieve    the    page    for    finding    captchas.')
    else:
        try:
            document_parser = DocumentParser.DocumentParser(response)
        except BaseFrameworkException:
            return []
        image_path_list = document_parser.get_references_of_tag('img')
        GET = self._uri_opener.GET
        sha1 = hashlib.sha1
        result_iter = self.worker_pool.imap_unordered(GET, image_path_list)
        for image_response in result_iter:
            if image_response.is_image():
                img_src = image_response.get_uri()
                img_hash = sha1(image_response.get_body()).hexdigest()
                res.append((img_src, img_hash, response))
    return res
