C# HttpWebRequest 到 HTTPS 失败

Question

我正在尝试以编程方式登录此网站 https://www.virginmobile.com.au（在右侧有一个会员登录表格）。

该表格有效。但是，当我对表单操作执行 POST 请求时 (https://www. virginmobile.com.au/selfcare/MyAccount/LogoutLoginPre.jsp）失败了。

它返回 302，然后跟踪到新位置，它返回 405。

这是我的代码 test1.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net;
using System.Text;
using System.IO;
using System.Security.Cryptography.X509Certificates;
using System.Net;


public partial class test1 : System.Web.UI.Page
{
  protected void Page_Load(object sender, EventArgs e)
  {
    string uri = "https://www.virginmobile.com.au/selfcare/MyAccount/LogoutLoginPre.jsp";
    string parameters = "username=0411222333&password=123";

    System.Net.ServicePointManager.CertificatePolicy = new MyPolicy();

    HttpWebRequest req = (HttpWebRequest)WebRequest.Create(uri);
    req.Method = "POST";
    req.ContentType = "application/x-www-form-urlencoded";
    //req.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.2) Gecko/20100316 Firefox/3.6.2 ( .NET CLR 3.0.4506.2152)";
    //req.Referer = "http://www.virginmobile.com.au/";
    //req.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
    req.AllowAutoRedirect = false;

    // Send the Post
    byte[] paramBytes = Encoding.ASCII.GetBytes(parameters);
    req.ContentLength = paramBytes.Length;
    Stream reqStream = req.GetRequestStream();
    reqStream.Write(paramBytes, 0, paramBytes.Length);   //Send it
    reqStream.Close();

    // Get the response
    HttpWebResponse response = (HttpWebResponse)req.GetResponse();
    if (response == null) throw new Exception("Response is null");

    if (!string.IsNullOrEmpty(response.Headers["Location"]))
    {
      string newLocation = response.Headers["Location"];

      // Request the new location
      req = (HttpWebRequest)WebRequest.Create(newLocation);
      req.Method = "POST";
      req.ContentType = "application/x-www-form-urlencoded";
      //req.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.2) Gecko/20100316 Firefox/3.6.2 ( .NET CLR 3.0.4506.2152)";
      //req.Referer = "http://www.virginmobile.com.au/";
      //req.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
      req.AllowAutoRedirect = false;
      req.CookieContainer = new CookieContainer();
      req.CookieContainer.Add(response.Cookies);

      // Send the Post
      paramBytes = Encoding.ASCII.GetBytes(parameters);
      req.ContentLength = paramBytes.Length;
      reqStream = req.GetRequestStream();
      reqStream.Write(paramBytes, 0, paramBytes.Length);   //Send it
      reqStream.Close();

      // Get the response
      response = (HttpWebResponse)req.GetResponse(); //**** 405 Method Not Allowed here
    }

    StreamReader sr = new StreamReader(response.GetResponseStream());
    string responseHtml = sr.ReadToEnd().Trim();

    Response.Write(responseHtml);
  }
}

public class MyPolicy : ICertificatePolicy
{
  public bool CheckValidationResult(ServicePoint srvPoint, X509Certificate certificate, WebRequest request, int certificateProblem)
  {
    return true; // Return true to force the certificate to be accepted.
  }
}

有人可以帮助我吗？提前致谢！

Answer 1

302 响应尝试将您重定向到另一个页面，因此问题可能是您的 POST 数据没有发送到重定向的页面。

也许尝试设置 HttpWebRequest.AllowAutoRedirect = false 并捕获您得到的异常
后退。然后创建另一个对重定向 URL（在 Location 响应标头中指定）的请求，然后使用相同的 POST 数据再次发出请求。

Answer 2

您随请求发送的标头很少。他们编写的脚本很可能期望存在某些标头。我能立即想到的标头是：

• User-Agent（标识您的浏览器和版本；例如，您可以假装是 Firefox）
• Referer（标识您来自的 URL；将主页 URL 放在这里）
• Accept-Charset、Accept-Encoding、Accept-Language

但可能有其他的。您可能可以使用您提到的 Fiddler 工具来找出 Firefox（或您使用的任何浏览器）通过正常（非 HTTPS）请求发送的标头，然后将其中一些标头添加到您的请求中，看看是否可以正常工作。 （就我个人而言，我使用 TamperData 来实现此目的，这是一个火狐浏览器插件。）

Answer 3

我收到 404 错误 - 远程服务器返回错误：(404) 未找到。下面是我在收到 405 错误的同一行代码中收到错误的代码。如果我将代码替换为您以前的版本，则不会返回 404，但会返回 405 错误。

谢谢

string uri = "https://www.virginmobile.com.au/selfcare/MyAccount/LogoutLoginPre.jsp?username=0466651800&password=160392";
string parameters = "username=0411223344&password=123456";

HttpWebRequest req = (HttpWebRequest)WebRequest.Create(uri);
req.Method = "GET";
req.ContentType = "application/x-www-form-urlencoded";
//req.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.2)     Gecko/20100316 Firefox/3.6.2 ( .NET CLR 3.0.4506.2152)";
//req.Referer = "http://www.virginmobile.com.au/";
//req.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
req.AllowAutoRedirect = false;

// Send the Post
byte[] paramBytes = Encoding.ASCII.GetBytes(parameters);
//req.ContentLength = paramBytes.Length
//Dim reqStream As Stream = req.GetRequestStream()
//reqStream.Write(paramBytes, 0, paramBytes.Length)
//Send it
//reqStream.Close()

// Get the response
HttpWebResponse response__1 = (HttpWebResponse)req.GetResponse();
if (response__1 == null) {
throw new Exception("Response is null");
}

if (!string.IsNullOrEmpty(response__1.Headers("Location"))) {
string newLocation = response__1.Headers("Location");

// Request the new location
req = (HttpWebRequest)WebRequest.Create(newLocation + "?" + parameters);
req.Method = "GET";
req.ContentType = "application/x-www-form-urlencoded";
req.AllowAutoRedirect = false;
req.CookieContainer = new CookieContainer();
req.CookieContainer.Add(response__1.Cookies);

// Send the Post
//paramBytes = Encoding.ASCII.GetBytes(parameters)
//req.ContentLength = paramBytes.Length
//Dim reqStream As Stream = req.GetRequestStream()
//reqStream.Write(paramBytes, 0, paramBytes.Length)
//Send it
//reqStream.Close()

// Get the response
//**** The remote server returned an error: (404) Not Found.
response__1 = (HttpWebResponse)req.GetResponse();
}

StreamReader sr = new StreamReader(response__1.GetResponseStream());
string responseHtml = sr.ReadToEnd().Trim();

Answer 4

已解决：405 是因为我发送的是 POST 而不是 GET