def METHOD_NAME(self):
    pool_kwargs = {
        'cert_reqs': 'CERT_REQUIRED',
        'ca_certs': certifi and certifi.where() or None
    }
    proxy_url = utils.get_proxy_url(self.url)
    if proxy_url:
        return urllib3.ProxyManager(proxy_url, **pool_kwargs)
    else:
        return urllib3.PoolManager(**pool_kwargs)