如何使用$ ref引用jsonschema中的json文件

Question

建议我如何在输入jsonschema中使用远程json文件。以下是我正在使用的两个文件，它们的异常网址为未知

first.json

{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "type": "object",
    "additionalProperties": false,
    "properties": {
        "ReferenceTosecondSchema": {
            "$ref": "second.json#/definitions/ExternalType"
        }
    }
}

second.json

{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "type": "object",
    "definitions": {
        "ExternalType": {
            "type": "object",
            "additionalProperties": false,
            "properties": {
                "src": {
                    "type": "array",
                    "items": {
                        "type": "string",
                        "minLength": 1
                    }
                }
            },
            "required": [
                "src"
            ]
        }
    }
}