Get all available zones

{
  "status": "ok",
  "data": [
    {
      "is_available": 1,
      "location": "Council Bluffs, Iowa, USA",
      "region": "us-central1",
      "zone": "us-central1-c"
    },
    {
      "is_available": 1,
      "location": "The Dalles, Oregon, USA",
      "region": "us-west1",
      "zone": "us-west1-a"
    },
    {
      "is_available": 1,
      "location": "Moncks Corner, South Carolina, USA",
      "region": "us-east1",
      "zone": "us-east1-b"
    }
  ]
}