blocks|key|2916938|text|您在错误的位置设置了代理凭据。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2916939|httpClientHandler.Credentials是您在代理建立连接后提供给服务器的凭据。如果你弄错了，你可能会得到401或403的响应。|offset|length|style|BOLD|2916940|您需要设置提供给proxy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。你会得到一个407，因为你从来没有设置过这些。|2916941|//+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);|code-block|syntax|javascript|2916942|entityMap^0|0|16|3|0|8|5|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@$D|S|E|T|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|U|8|@$D|V|E|W|F|G]]|9|@]|A|$]]|$1|J|3|K|5|L|7|X|8|@]|9|@]|A|$M|N]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

You're setting the proxy credentials in the wrong place.

httpClientHandler.Credentials are the credentials you give to the server after the proxy has already established a connection. If you get these wrong, you'll probably get a 401 or 403 response.

You need to set the credentials given to the proxy, or it will refuse to connect you to the server in the first place. The credentials you provide to the proxy may be different from the ones you provide to the server. If you get these wrong, you'll get a 407 response. You're getting a 407 because you never set these at all.

<pre><code>// 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);
</code></pre>

blocks|key|137956|text|我发现了一些关于这个here+from+social.msdn.microsoft.com的有用信息。根据我所做的回复、测试和对System.Net.WebProxy+Class的研究，您需要将代理凭据传递到代理对象，而不是HttpClientHandler。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|137957|{
++++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),
};|code-block|syntax|javascript|137958|这实际上是为了验证到代理的连接，而不是HttpClientHandler。|137959|entityMap|0|LINK|mutability|MUTABLE|url|https://social.msdn.microsoft.com/Forums/vstudio/en-US/c06d3032-dceb-4a1a-bb6a-778fd13a938a/407-proxy-authentication-required|1|https://msdn.microsoft.com/en-us/library/system.net.webproxy%2528v=vs.110%2529.aspx^0|A|Z|0|1S|P|1|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]|$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|F|7|11|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|12|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

I found some useful information about this <a href="https://social.msdn.microsoft.com/Forums/vstudio/en-US/c06d3032-dceb-4a1a-bb6a-778fd13a938a/407-proxy-authentication-required" rel="nofollow noreferrer">here from social.msdn.microsoft.com</a>. From the replies, tests I made and research into the <a href="https://msdn.microsoft.com/en-us/library/system.net.webproxy%28v=vs.110%29.aspx" rel="nofollow noreferrer">System.Net.WebProxy Class</a> you need to pass the proxy credentials into the proxy object, not the HttpClientHandler.

<pre><code>{
 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),
};
</code></pre>

This actually is meant to authenticate the connection to the proxy, not the HttpClientHandler.

blocks|key|2704408|text|您需要传递一个代理处理程序。试试这个，它对我很有效|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2704409|var+handler+=+new+HttpClientHandler();
handler.DefaultProxyCredentials+=+CredentialCache.DefaultCredentials;

var+client+=+new+HttpClient(handler);

HttpResponseMessage+response+=+await+client.SendAsync();|code-block|syntax|javascript|2704410|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You need to pass a proxy Handler. try this it worked for me 

<pre><code>var handler = new HttpClientHandler();
handler.DefaultProxyCredentials = CredentialCache.DefaultCredentials;

var client = new HttpClient(handler);

HttpResponseMessage response = await client.SendAsync();
</code></pre>

Here is the code:

<pre><code> 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);
</code></pre>

And when I finally do this:

<pre><code>HttpResponseMessage httpResponseMessage = this.client.PostAsync(urlToPost, new StringContent(data, Encoding.UTF8, this.mediaType)).Result;
</code></pre>

It always throws the 

<blockquote>
 The remote server returned an error: (407) Proxy Authentication
 Required.
</blockquote>

Which I do not understand for the world of me.

The same proxy set up works just fine when is configured in IE10 or if I use the <code>HttpWebRequest</code> class instead

HttpClient and using proxy - constantly getting 407

身份验证

服务器

代码如下： HttpClient client = null; HttpClientHandler httpClientHandler = new HttpClientHandler() {    Proxy = new WebProxy(string.Format("{0}:{1}", proxyServerSett...

问HttpClient和使用代理-不断获得407
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