HTTPWebRequest 403 禁止

Question

我正在嘗試向服務器形成一個 HttpWebRequest。 我已經測試了我正在使用的用戶名和密碼，並且他們使用目標網站上的登錄表單正確地進行了身份驗證。

我檢查並閱讀了 Stack 上關於 403 涉及 HttpWebRequest 的所有其他帖子，並更新了我的代碼以具有有效的用戶代理、Accept 字段和 ContentType。 省略前三個屬性之一似乎是人們最常犯的錯誤。

我的代碼在下面並打印“已創建響應遠程服務器返回錯誤：（403）禁止。”

{
    HttpWebRequest request = buildRequest(url);        
    print("Response Created");
    try
    {
        using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
        {
            //Do stuff with the response
        }
    }
    catch (Exception ex)
    {
        print(ex.Message);
    }
    Done.Visible = true;
}

private HttpWebRequest buildRequest(String url)
{
    HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
    //I also tried authenticating in the header with no luck.
    //byte[] authBytes = Encoding.UTF8.GetBytes("username:password".ToCharArray());
    //req.Headers["Authorization"] = "Basic " + Convert.ToBase64String(authBytes);
    req.Method = "GET";
    req.Credentials = new NetworkCredential("username","password");
    req.UserAgent = "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_6; en-us) AppleWebKit/533.20.25 (KHTML, like Gecko) Version/5.0.4 Safari/533.20.27";
    req.PreAuthenticate = true;
    req.Accept = "application/json";
    req.ContentType = "application/json; charset=utf-8";
    req.KeepAlive = true;
    return req;
}

謝謝你的幫助。

Answer 1

使用System.Net.CookieContainer在后續調用中接收和設置 cookie。 CookieContainer屬性在不同請求中是有狀態的。

這是 MSDN 文檔。

public SomeClass 
{
    var _cookies = new CookieContainer();

    private HttpWebRequest buildRequest(String url)  
    {  
       HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);  
       req.CookieContainer = _cookies;
       // omitted rest of code
    }

}

Answer 2

您確定網站在登錄時沒有使用 POST 方法嗎？ 如果沒有，那么請忽略此答案。

如果網站在提交數據時使用 POST 方法，您需要在提交之前將數據附加到請求的末尾（您可以使用 Fiddler 輕松檢查）：

string postDataString = "foo1=bar1&foo2=bar2&foo3=bar3";
//Use whatever encoding is appropriate for the submission
byte[] postData = Encoding.ASCII.GetBytes(postDataString);


//When building your request, set the ContentLength property and append the data
req.ContentLength = postData.Length;

using (Stream dataStream = req.GetRequestStream())
{
    dataStream.Write(postData, 0, postData.Length);
}