Proxy Basic Authentication in C HTTP 407 error

Question

I am working with a proxy that requires authentication  i e   in a browser if I try to open a page it will immediately ask for credentials  I supplied same credentials in my program but it fails with HTTP 407 error   Here is my code   HttpWebRequest request    HttpWebRequest WebRequest Create URL    IWebProxy proxy   WebRequest GetSystemWebProxy    CredentialCache cc   new CredentialCache    NetworkCredential nc   new NetworkCredential     nc UserName    userName   nc Password    password   nc Domain    mydomain   cc Add  http   20 154 23 100   8888   Basic   nc   proxy Credentials   cc    proxy Credentials   System Net CredentialCache DefaultCredentials  request Proxy   proxy  request Proxy Credentials   cc  request Credentials   cc  request PreAuthenticate   true    I have tried every possible thing but seem like I am missing something  Is it something like  I have to make two requests  First with out credentials and once I hear back from server about need for credentials  make same request with credentials

User · Answer

I was getting a very similar situation where the HttpWebRequest wasn't picking up the correct proxy details by default and setting the UseDefaultCredentials didn't work either. Forcing the settings in code however worked a treat:

IWebProxy proxy = myWebRequest.Proxy;
if (proxy != null) {
    string proxyuri = proxy.GetProxy(myWebRequest.RequestUri).ToString();
    myWebRequest.UseDefaultCredentials = true;
    myWebRequest.Proxy = new WebProxy(proxyuri, false);
    myWebRequest.Proxy.Credentials = System.Net.CredentialCache.DefaultCredentials;
}

and because this uses the default credentials it should not ask the user for their details.

User · Answer

try this           var YourURL    http   yourUrl              HttpClientHandler handler   new HttpClientHandler                             Proxy   new WebProxy  http   127 0 0 1 8888                  UseProxy   true                          Console WriteLine YourURL              HttpClient client   new HttpClient handler

User · Answer

This method may avoid the need to hard code or configure proxy credentials  which may be desirable   Put this in your application configuration file - probably app config  Visual Studio will rename it to yourappname exe config on build  and it will end up next to your executable  If you don t have an application configuration file  just add one using Add New Item in Visual Studio    lt  xml version  1 0  encoding  utf-8    gt   lt configuration gt     lt system net gt       lt defaultProxy useDefaultCredentials  true    gt     lt  system net gt   lt  configuration gt

User · Answer

I had a similar problem due to a password protected proxy server and couldn t find much in the way of information out there - hopefully this helps someone  I wanted to pick up the credentials as used by the customer s browser  However  the CredentialCache DefaultCredentials and DefaultNetworkCredentials aren t working when the proxy has it s own username and password even though I had entered these details to ensure thatInternet explorer and Edge had access  The solution for me in the end was to use a nuget package called  quot CredentialManagement Standard quot  and the below code  using WebClient webClient   new WebClient        var request   WebRequest Create  quot http   google co uk quot    var proxy   request Proxy GetProxy new Uri  quot http   google co uk quot      var cmgr   new CredentialManagement Credential     Target   proxy Host    if  cmgr Load          var credentials   new NetworkCredential cmgr Username  cmgr Password       webClient Proxy Credentials   credentials      webClient Credentials   credentials     This grabs credentials from  Credentials Manager  - which can be found via Windows - click Start then search for  Credentials Manager   Credentials for the proxy that were manually entered when prompted by the browser will be in the   Windows Credentials section

User · Answer

here is the correct way of using proxy along with creds    HttpWebRequest request    HttpWebRequest WebRequest Create URL    IWebProxy proxy   request Proxy                      if  proxy    null        Console WriteLine  Proxy   0    proxy GetProxy request RequestUri      else       Console WriteLine  Proxy is null  no proxy will be used       WebProxy myProxy   new WebProxy    Uri newUri   new Uri  http   20 154 23 100 8888       Associate the newUri object to  myProxy  object so that new myProxy settings can be set  myProxy Address   newUri     Create a NetworkCredential object and associate it with the     Proxy property of request object  myProxy Credentials   new NetworkCredential  userName    password    request Proxy   myProxy    Thanks everyone for help

User · Answer

You can use like this  it works           WebProxy proxy   new WebProxy                       Address   new Uri                  Credentials   new NetworkCredential                             HttpClientHandler httpClientHandler   new HttpClientHandler                       Proxy   proxy              UseProxy   true                     HttpClient client   new HttpClient httpClientHandler            HttpResponseMessage response   await client PostAsync

User · Answer

This problem had been bugging me for years the only workaround for me was to ask our networks team to make exceptions on our firewall so that certain URL requests didn t need to be authenticated on the proxy which is not ideal   Recently I upgraded the project to  NET 4 from 3 5 and the code just started working using the default credentials for the proxy  no hardcoding of credentials etc   request Proxy Credentials   CredentialCache DefaultCredentials

[c#] Proxy Basic Authentication in C#: HTTP 407 error

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