How to get the value when C# crawler encounters EventStream data

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Today when I called the interface of a website, I found that the data format was like this. It was the first time I encountered it.

 The normal thing should be like this, there is a "response", and then the response contains some returned data.

And this is very strange, there is no "response", only an EventStream. I've been searching online for a long time but haven't seen any relevant tutorials on how to obtain this data. There are some, but you need to be a member. I'm really convinced.

Just put the code:

            //url和postdata是接口地址和post参数
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "POST";
            request.ContentType = "application/json";
            request.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36";
            byte[] byteArray = System.Text.Encoding.UTF8.GetBytes(postdata);
            request.ContentLength = byteArray.Length;

            using (Stream dataStream = request.GetRequestStream())
            {
                dataStream.Write(byteArray, 0, byteArray.Length);
            }

            using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
            {
                using (StreamReader reader = new StreamReader(response.GetResponseStream()))
                {
                    string line = string.Empty;
                    while (!reader.EndOfStream)
                    {
                        line += reader.ReadLine();
                    }
                    return line;//这个就是EventStream里面所有的数据
                }
            }

In fact, it’s thanks to chatgpt!