Workflow: HTTP Schedule Automation

{
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    "meta": {
        "instanceId": "8437bf0b955ff2039c820e1d56f4a2d7ce67e59f0897cc8ac064cfea1d9dbec6"
    },
    "name": "URL Pinger",
    "tags": [],
    "nodes": [
        {
            "id": "5b3b5251-d460-4eae-a931-e4772749a927",
            "name": "Split Out",
            "type": "n8n-nodes-base.splitOut",
            "position": [
                900,
                460
            ],
            "parameters": {
                "options": {
                    "destinationFieldName": "url"
                },
                "fieldToSplitOut": "urls"
            },
            "typeVersion": 1
        },
        {
            "id": "b19bec9b-de09-42a7-8576-2cef3e0f9288",
            "name": "Schedule Trigger",
            "type": "n8n-nodes-base.scheduleTrigger",
            "position": [
                460,
                460
            ],
            "parameters": {
                "rule": {
                    "interval": [
                        {
                            "field": "minutes",
                            "minutesInterval": 15
                        }
                    ]
                }
            },
            "typeVersion": 1.1999999999999999555910790149937383830547332763671875
        },
        {
            "id": "584a4340-7053-4afd-ae3e-f0c1f2de2586",
            "name": "HTTP Request",
            "type": "n8n-nodes-base.httpRequest",
            "onError": "continueRegularOutput",
            "position": [
                1100,
                460
            ],
            "parameters": {
                "url": "={{ $json.url }}",
                "options": []
            },
            "typeVersion": 4.20000000000000017763568394002504646778106689453125
        },
        {
            "id": "d53b8c24-7408-4e09-8360-f13ecfa5deca",
            "name": "URLs List",
            "type": "n8n-nodes-base.set",
            "position": [
                680,
                460
            ],
            "parameters": {
                "options": [],
                "assignments": {
                    "assignments": [
                        {
                            "id": "9e5e8792-c5ee-4ce2-9a9a-0b3ad274cae6",
                            "name": "urls",
                            "type": "array",
                            "value": "={{ ['http:\/\/firsturl.com', 'https:\/\/secondurl.com', 'https:\/\/thirdurl.com'] }}"
                        }
                    ]
                }
            },
            "typeVersion": 3.29999999999999982236431605997495353221893310546875
        }
    ],
    "active": false,
    "pinData": [],
    "settings": {
        "executionOrder": "v1"
    },
    "versionId": "71356023-fe84-4b30-9df8-3c5dc25fbcca",
    "connections": {
        "Split Out": {
            "main": [
                [
                    {
                        "node": "HTTP Request",
                        "type": "main",
                        "index": 0
                    }
                ]
            ]
        },
        "URLs List": {
            "main": [
                [
                    {
                        "node": "Split Out",
                        "type": "main",
                        "index": 0
                    }
                ]
            ]
        },
        "Schedule Trigger": {
            "main": [
                [
                    {
                        "node": "URLs List",
                        "type": "main",
                        "index": 0
                    }
                ]
            ]
        }
    }
}