c# - HttpClient 和使用代理 - 不断得到 407

Question

代码如下:

 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;

它总是抛出

The remote server returned an error: (407) Proxy Authentication Required.

我不明白我的世界。

相同的代理设置在 IE10 中配置时工作正常，或者如果我改用 HttpWebRequest 类

Answer 1

您在错误的位置设置了代理凭据。

httpClientHandler.Credentials 是您在代理已建立连接后提供给服务器 的凭据。如果您弄错了这些，您可能会收到 401 或 403 响应。

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，你会得到一个 407 响应。您收到 407 是因为您根本没有设置这些。

// First create a proxy object
var proxy = new WebProxy
{
    Address = new Uri($"http://{proxyHost}:{proxyPort}"),
    BypassProxyOnLocal = 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);