Telegram对webhook Flask应用程序的更新是什么结构？

{
  "update_id": 123456789,
  "message": {
    "message_id": 123,
    "from": {
      "id": 123456789,
      "is_bot": false,
      "first_name": "John",
      "last_name": "Doe",
      "username": "johndoe"
    },
    "chat": {
      "id": 123456789,
      "first_name": "John",
      "last_name": "Doe",
      "type": "private"
    },
    "date": 1633072800,
    "text": "/start",
    "entities": [
      {
        "offset": 0,
        "length": 6,
        "type": "bot_command"
      }
    ]
  }
}

from flask import Flask, request, jsonify

app = Flask(__name__)

@app.route('/webhook', methods=['POST'])
def webhook():
    update = request.json
    if 'message' in update:
        message = update['message']
        chat_id = message['chat']['id']
        text = message.get('text', '')

        # 处理消息
        if text == '/start':
            send_message(chat_id, "Hello! Welcome to my bot.")
        else:
            send_message(chat_id, f"You said: {text}")

    return jsonify({'status': 'ok'})

def send_message(chat_id, text):
    url = f"https://api.telegram.org/bot<YOUR_BOT_TOKEN>/sendMessage"
    payload = {
        'chat_id': chat_id,
        'text': text
    }
    response = requests.post(url, json=payload)
    return response.json()

if __name__ == '__main__':
    app.run(port=5000)