HttpClient和使用代理 - 不断获得407

Question

这是代码:

 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;

它总是抛出

远程服务器返回错误:(407)需要代理身份验证.

对于我这个世界,我不明白.

在IE10中配置或者我使用HttpWebRequest该类时,相同的代理设置工作正常

Answer 1

您将代理凭据设置在错误的位置.

httpClientHandler.Credentials是代理已建立连接后您为服务器提供的凭据.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($"http://{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

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

var client = new HttpClient(handler);

HttpResponseMessage response = await client.SendAsync();