C# API 调用不适用于 HttpWebRequest 但可用于 Postman

C# API Call doesn't work with HttpWebRequest but do work with Postman

我有以下邮递员请求:

哪个returns我果然是URL:

我正在尝试使用 .Net Core 2.0 应用程序模拟此操作,代码如下:

static void Main(string[] args)
{
    ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

    var httpWebRequest = (HttpWebRequest)WebRequest.Create("https://epaper.20minuten.ch/index.cfm/epaper/1.0/getEditionDoc");
    httpWebRequest.ContentType = "application/json";
    httpWebRequest.Method = "POST";

    var serializer = new Newtonsoft.Json.JsonSerializer();
    using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
    {
        using (var tw = new Newtonsoft.Json.JsonTextWriter(streamWriter))
        {
            serializer.Serialize(tw,
                new
                {
                    editions = new[]
                    {
                            new
                            {
                                defId = "648",
                                publicationDate = "2018-03-06"
                            }
                    },
                    isAttachment = true,
                    fileName = "Gesamtausgabe_Lausanne_2018-03-06.pdf"
                });
        }
    }
    var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
    using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
    {
        var responseText = streamReader.ReadToEnd();
        Console.ReadLine();
    }
}

但是我收到 500 个错误。我错过了什么?

我猜问题可能是由于您正在调用外部 url 可能会出现它们阻止像这样的抓取请求的情况。尝试为请求设置用户代理以模拟浏览器调用。

Postman 可以生成各种各样的代码。要将 RestSharp 与 C# 结合使用,请单击代码 button/link 并从下拉列表中选择 C# (RestSharp)

它应该类似于:

有一天我会为 HttpClient 和 HttpWebRequest 贡献一个生成器