$ cf curl /v2/routes?q=host:testapp
{
  "total_results": 2,
  "total_pages": 1,
  "prev_url": null,
  "next_url": null,
  "resources": [
    {
      "metadata": {
        "guid": "83d60b98-5864-45c6-94ad-4d02f5f4216a",
        "url": "/v2/routes/83d60b98-5864-45c6-94ad-4d02f5f4216a",
        "created_at": "2019-11-09T10:40:04Z",
        "updated_at": "2019-11-09T10:40:04Z"
      },
      "entity": {
        "host": "tired-duck-brash-civet",
        "path": "",
        "domain_guid": "fb6bd89f-2ed9-49d4-9ad1-97951a573135",
        "space_guid": "d6cddaa6-0886-44b3-9590-16717d5cd3c2",
        "service_instance_guid": null,
        "port": null,
        "domain_url": "/v2/shared_domains/fb6bd89f-2ed9-49d4-9ad1-97951a573135",
        "space_url": "/v2/spaces/d6cddaa6-0886-44b3-9590-16717d5cd3c2",
        "apps_url": "/v2/routes/83d60b98-5864-45c6-94ad-4d02f5f4216a/apps",
        "route_mappings_url": "/v2/routes/83d60b98-5864-45c6-94ad-4d02f5f4216a/route_mappings"
      }
    }
  ]
}