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ESPAsyncWebserver 处理程序示例（int 查询参数）

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此示例基于我们的基本示例并展示如何使用 int 查询参数，例如 http://192.168.1.112/api/test?param=2

espasyncwebserver_handler_example.cpp
server.on("/api/test", HTTP_GET, [](AsyncWebServerRequest *request) {
      int param = request->getParam("param")->value().toInt();
      // TODO：用 param 做些什么！

      // 以 JSON {"status": "ok"} 响应
      AsyncResponseStream *response = request->beginResponseStream("application/json");
      DynamicJsonDocument json(1024);
      json["status"] = "ok";
      json["param"] = param;
      serializeJson(json, *response);
      request->send(response);
});
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