The response from a URL protected by Cloudflare may only provide a
relevant cookie on the first response but
`#curl_http_content_headers_and_checksum` only returns the headers of
the final response. In this scenario, `#curl_check_http_content` isn't
able to properly detect the protected URL and this is surfaced as an
error instead of skipping the URL.
This resolves the issue by including the array of response hashes in
the return value from `#curl_http_content_headers_and_checksum`, so
we can check all the responses in `#curl_check_http_content`.
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