{
  "topic": "example-topic",
  "type": "fill_blank",
  "schema_version": "1.0.0",
  "generated": "2026-01-01T00:00:00Z",
  "questions": [
    {
      "id": "dom-sub-top-fb-001",
      "type": "fill_blank",
      "difficulty": 3,
      "tags": ["example", "template"],
      "question": "HTTP 协议默认使用 ______ 端口，HTTPS 默认使用 ______ 端口。",
      "answer": ["80", "443"],
      "answer_rule": "ordered",
      "explanation": "HTTP 默认端口为 80，HTTPS 默认端口为 443。这是网络编程的基础知识。answer_rule 设为 ordered 表示答案顺序必须与题目中的空白顺序一致。",
      "source": null,
      "related": []
    }
  ]
}