Question

我正在使用Microsoft的HttpClient向第三方RESTful服务发出请求。除了这个例子之外，它完美无缺（并且非常容易实现）。以下是提供商对错误期间发生的情况的细分：

“POST到组资源的工作方式是，当它完成时，它会将HTTP 302重定向到组实例资源。似乎正在发生什么是您的HTTP客户端正在向POST发送正确的身份验证信息，这会创建组资源，但是当它处理HTTP 302请求的GET时，它不会发送正确的凭据并且正在获取401响应。你能检查你的客户端库并确保它在重定向上正确发送HTTP身份验证参数吗？“

这是我的POST代码：

HttpClient http = new HttpClient(BASE_URL);
http.TransportSettings.Credentials = new NetworkCredential(ACCOUNT_SID, 
                                       ACCOUNT_TOKEN);
HttpResponseMessage httpResponse = http.Post(groupUri, "application/xml", 
                                       HttpContent.Create(xml.ToString()));
result = httpResponse.Content.ReadAsString();

这让我想到了我的问题;如何使用HttpClient类获取要在此GET重定向上发送的身份验证参数？

Answer 1

我遇到了类似的问题，最后我添加了一个带有 WebBrowser控件的表单。无需拨打form.Show()我可以告诉他导航到URL，点击按钮等等。以下是控制该表单的类：

public class Nav
{
    FormNav formNav = new FormNav();
    public string Source
    {
        get
        {
            mshtml.HTMLDocument doc = (mshtml.HTMLDocument)formNav.webBrowser.Document.DomDocument;
            return doc.documentElement.innerHTML;
        }
    }

    public void GoTo(string Url)
    {
        formNav.webBrowser.Navigate(Url);
        Wait();
    }

    public void Fill(string Field, string Value)
    {
        formNav.webBrowser.Document.GetElementById(Field).InnerText = Value;
    }

    public void Click(string Element)
    {
        formNav.webBrowser.Document.GetElementById(Element).InvokeMember("click");
        Wait();
        Application.DoEvents();
    }

    public void Wait()
    {
        const int TIMEOUT = 30;

        formNav.Ready = false;
        DateTime start = DateTime.Now;
        TimeSpan span;

        do
        {
            Application.DoEvents();
            span = DateTime.Now.Subtract(start);
        } while (!formNav.Ready && span.Seconds < TIMEOUT);
    }

    public void Dispose()
    {
        formNav.Dispose();
    }
}

这是表单的代码（需要一些额外的代码来禁用单击声音）。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

public partial class FormNav : Form
{
    private const int FEATURE_DISABLE_NAVIGATION_SOUNDS = 21;
    private const int SET_FEATURE_ON_THREAD = 0x00000001;
    private const int SET_FEATURE_ON_PROCESS = 0x00000002;
    private const int SET_FEATURE_IN_REGISTRY = 0x00000004;
    private const int SET_FEATURE_ON_THREAD_LOCALMACHINE = 0x00000008;
    private const int SET_FEATURE_ON_THREAD_INTRANET = 0x00000010;
    private const int SET_FEATURE_ON_THREAD_TRUSTED = 0x00000020;
    private const int SET_FEATURE_ON_THREAD_INTERNET = 0x00000040;
    private const int SET_FEATURE_ON_THREAD_RESTRICTED = 0x00000080;

    [DllImport("urlmon.dll")]
    [PreserveSig]
    [return: MarshalAs(UnmanagedType.Error)]
    static extern int CoInternetSetFeatureEnabled(
        int FeactureEntry,
        [MarshalAs(UnmanagedType.U4)] int dwFlags,
        bool fEnable);

    public bool Ready;

    public FormNav()
    {
        InitializeComponent();
        Ready = true;

        int feature = FEATURE_DISABLE_NAVIGATION_SOUNDS;
        CoInternetSetFeatureEnabled(feature, SET_FEATURE_ON_PROCESS, true);
    }

    private void webBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
        Ready = true;
    }
}

如果需要源代码，则应添加 Microsoft Html对象 COM库。

Microsoft.Http.HttpClient，在重定向上正确发送HTTP身份验证参数

1 个答案: