[
  {
    "idx": 1,
    "url": "http://www.firehouse.com/article/12249720/the-fire-service-and-the-aviation-industry-firefighter-safety-crew-resource-management",
    "ok": true,
    "error": null
  },
  {
    "idx": 2,
    "url": "https://en.wikipedia.org/wiki/High_reliability_organization",
    "ok": true,
    "error": null
  },
  {
    "idx": 3,
    "url": "https://codeascraft.com/2010/12/08/track-every-release/",
    "ok": false,
    "error": "HTTP 403"
  },
  {
    "idx": 4,
    "url": "http://searchnetworking.techtarget.com/feature/Undersea-cables-keep-global-enterprise-networks-afloat",
    "ok": true,
    "error": null
  },
  {
    "idx": 5,
    "url": "http://sdtimes.com/testing-production-comes-shadows/",
    "ok": true,
    "error": null
  },
  {
    "idx": 6,
    "url": "https://www.lexneva.name/blog/2008/06/11/two-suggestions-to-help-sl-scale/",
    "ok": false,
    "error": "HTTP 404"
  },
  {
    "idx": 7,
    "url": "http://www.heraldcourier.com/workittricities/business_wire/delta-says-it-lost-million-in-revenue-due-to-big/article_99b10454-36ee-5b00-862d-ef6e2712072d.html",
    "ok": false,
    "error": "HTTP 404"
  },
  {
    "idx": 8,
    "url": "http://www.networkworld.com/article/3113660/data-center/were-learning-the-wrong-lessons-from-airline-it-outages.html",
    "ok": false,
    "error": "HTTP 404"
  }
]