从zomato或https网站抓取数据

I want to download data from Zomato website. Error comes all of https:// call. using c# codding

using (WebClient client = new WebClient()) { var htmlCode = client.DownloadString("https://www.zomato.com/kolkata/double-dakers-lane-behala");
}

错误: 1.无法从传输连接中读取数据:连接尝试失败,因为一段时间后被连接方未正确响应,或者建立连接失败,因为连接的主机未响应。

2.基础连接已关闭:接收时发生意外错误。

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