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                        "file_size": null,
                        "content_type": "application\/javascript; charset=utf-8",
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                "file_count": 4
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        "local_file_count": 0,
        "sync": {
            "upstream": "cdnjs",
            "index_ttl": 1800,
            "note": "未落盘的文件由透明回源实时提供，URL 恒定不变"
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}