def cert_get_serial(cert):
    return cert.serial
Extract rate limit info from response/headers.
dataset/ETHPy150Open Netflix/security_monkey/security_monkey/watchers/iam/iam_ssl.py/cert_get_serial--crossover with--dataset/ETHPy150Open Impactstory/total-impact-webapp/totalimpactwebapp/twitter_paging.py/TwitterPager.extract_rate_limit