Question

我正在尝试“以编程方式”使用HTTP发布请求登录Instagram。虽然，每当我尝试对此网址执行此操作时：https://instagram.com/accounts/login/ - 它会给我404错误。但是，如果我从末尾删除斜杠，例如/ accounts / login，然后它会工作，但是，响应体似乎只是一个简单的GET请求，因为它们只是输出相同的GET请求。我实际上期待一条错误消息作为回应。

代码是用C＃编写的，没什么特别的;基本上是一个http web request，然后我在TCP流中写了帖子数据。该网站正在使用CSRF令牌，该令牌需要包含在发布请求中，因此我首先使用简单的GET请求获取此密钥，然后继续POST。

我缺少哪些技术方面？我已经尝试过代码并在其他几个网站上做了同样的事情，所有的尝试都是成功的。

代码看起来很像（同样的问题）：

    WebResponse Response; 
HttpWebRequest Request;
Uri url = new Uri("https://instagram.com/accounts/login/");

CookieContainer cookieContainer = new CookieContainer();

Request = (HttpWebRequest)WebRequest.Create(url);
Request.Method = "GET";
Request.CookieContainer = cookieContainer;

// Get the first response to obtain the cookie where you will find the "csrfmiddlewaretoken" value
Response = Request.GetResponse(); 

string Parametros = "csrfmiddlewaretoken=" + cookieContainer.GetCookies(url)["csrftoken"].Value + "&username=USER&password=PASSWORD&next="; // This whill set the correct url to access

Request = (HttpWebRequest)WebRequest.Create(url); // it is important to use the same url used for the first request
Request.Method = "POST";
Request.ContentType = "application/x-www-form-urlencoded";
Request.UserAgent = "Other";
// Place the cookie container to obtain the new cookies for further access
Request.CookieContainer = cookieContainer;
Request.Headers.Add("Cookie",Response.Headers.Get("Set-Cookie")); // This is the most important step, you have to place the cookies at the header (without this line you will get the 403 Forbidden exception                                                   

byte[] byteArray = Encoding.UTF8.GetBytes(Parametros);
Request.ContentLength = byteArray.Length;

Stream dataStream = Request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();

Response = Request.GetResponse(); // Fails here

提前致谢！

向Instagram提交帖子请求时的403错误响应

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