Question

以下是代码：

 HttpClient client = null;
 HttpClientHandler httpClientHandler = new HttpClientHandler()
 {
    Proxy = new WebProxy(string.Format("{0}:{1}", proxyServerSettings.Address, 
    proxyServerSettings.Port),false),
    PreAuthenticate = true,
    UseDefaultCredentials = false,
 };


 this.httpClientHandler.Credentials = new NetworkCredential(proxyServerSettings.UserName, 
                        proxyServerSettings.Password);


 this.client = new HttpClient(this.httpClientHandler);

当我最终这样做时：

HttpResponseMessage httpResponseMessage = this.client.PostAsync(urlToPost, new StringContent(data, Encoding.UTF8, this.mediaType)).Result;

总是抛出

远程服务器返回错误：（407）代理验证必需的。

我不了解我的世界。

在IE10中配置相同的代理设置或者如果我使用HttpWebRequest类而不是

Answer 1

您在错误的位置设置代理凭据。

httpClientHandler.Credentials是代理已建立连接后您提供给服务器的凭据。如果你弄错了，你可能会收到401或403的回复。

您需要设置提供给代理的凭据，否则它将首先拒绝将您连接到服务器。您提供给代理的凭据可能与您提供给服务器的凭据不同。如果你弄错了，你会得到407回复。你得到的是407，因为你根本没有设置这些。

// First create a proxy object

var proxy = new WebProxy()
{
    Address = new Uri($"{proxyHost}:{proxyPort}"),
    BypassOnLocal = false,
    UseDefaultCredentials = false,

    // *** These creds are given to the proxy server, not the web server ***
    Credentials = new NetworkCredential(
        userName: proxyUserName,
        password: proxyPassword);
};

// Now create a client handler which uses that proxy

var httpClientHandler = new HttpClientHandler()
{
    Proxy = proxy,
};

// Omit this part if you don't need to authenticate with the web server:
if (needServerAuthentication)
{
    httpClientHandler.PreAuthenticate = true;
    httpClientHandler.UseDefaultCredentials = false;

    // *** These creds are given to the web server, not the proxy server ***
    httpClientHandler.Credentials = new NetworkCredential(
        userName: serverUserName,
        password: serverPassword);
}

// Finally, create the HTTP client object

var client = new HttpClient(handler: httpClientHandler, disposeHandler: true);

Answer 2

您需要传递代理处理程序。试试这个对我有用的

var handler = new HttpClientHandler();
handler.DefaultProxyCredentials = CredentialCache.DefaultCredentials;

var client = new HttpClient(handler);

HttpResponseMessage response = await client.SendAsync();

Answer 3

我找到了一些有关此here from social.msdn.microsoft.com的有用信息。从回复，我做的测试和研究System.Net.WebProxy Class您需要将代理凭证传递到代理对象，而不是HttpClientHandler。

{
    Proxy = new WebProxy(string.Format("{0}:{1}", proxyServerSettings.Address, 
    proxyServerSettings.Port),false),
    PreAuthenticate = true,
    UseDefaultCredentials = false,
    Credentials = new System.Net.NetworkCredential(proxyServerSettings.UserName, 
                    proxyServerSettings.Password),
};

这实际上是为了验证与代理的连接，而不是HttpClientHandler。

HttpClient和使用代理 - 不断获得407

3 个答案: