[
  {
    "idx": 1,
    "url": "https://www.usenix.org/conference/srecon17americas/call-for-participation",
    "ok": true,
    "error": null
  },
  {
    "idx": 2,
    "url": "http://www.tmcnet.com/usubmit/-datadog-announces-machine-learning-based-anomaly-detection-cloud-/2016/10/27/8443520.htm",
    "ok": true,
    "error": null
  },
  {
    "idx": 3,
    "url": "https://medium.com/production-ready/from-zero-to-staging-and-back-cede8e29f5c#.dpl7b1iqa",
    "ok": false,
    "error": "HTTP 403"
  },
  {
    "idx": 4,
    "url": "https://honeycomb.io/blog/2016/11/nylas-guest-post-ghosts-in-the-wsgi-machine/",
    "ok": false,
    "error": "HTTP 404"
  },
  {
    "idx": 5,
    "url": "http://www.susanjfowler.com/blog/2016/11/2/the-irreproducibility-of-bugs-in-large-scale-production-systems",
    "ok": true,
    "error": null
  }
]