Google Drive API proxy exception 407

Question

Im trying to download files from google disk. Auth Class:

internal static class Perm_AppData
{
    private static string[] scopes = { DriveService.Scope.DriveFile };
    private static DriveService service = Autorization();
    internal static DriveService Service { get { return service; } }

    private static DriveService Autorization()
    {
        UserCredential credential;

        using (var stream = GetCliSecStream())
        {
            credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
                GoogleClientSecrets.Load(stream).Secrets,
                scopes,
                "user",
                CancellationToken.None,
                new FileDataStore(auth, true)).Result;
        }

        return new DriveService(new BaseClientService.Initializer()
        {
            HttpClientInitializer = credential,
            ApplicationName = applicationName
        });
    }

    private static Stream GetCliSecStream()
    {
        var stream = new MemoryStream();
        var writer = new StreamWriter(stream);
        writer.Write(uSec);
        writer.Flush();
        stream.Position = 0;
        return stream;
    }
}

After that, I chose an account and confirmed the rights of the application. Next is the request to download the file

internal static MemoryStream DownloadFile(string fileId = null, string fileName = null)
{
    using (new Watcher($"Download {fileName} {fileId}"))
    {
        GetRequest request = null;
        if (fileId != null)
        {
            request = service.Files.Get(fileId);
        }
        else
        {
            if (fileName != null)
            {
                request = service.Files.Get(ViewDrive(SearchParameter.name, new string[] { fileName }).First().Id);
            }
            else
            {
                throw new Exception("You need at least one not null parameter to download");
            }
        }

        request.Fields = "id, name";
        var fileMemoryStream = new MemoryStream();
        request.Download(fileMemoryStream);
        return fileMemoryStream;
    }
}

Downloading the file throws an exception (System.Net.WebException: The remote server returned an error: (407) Requires proxy authentication):

Error: System.TypeInitializationException: Инициализатор типа "Updater.UnDloadAP I" выдал исключение. ---> System.TypeInitializationException: Инициализатор типа "Updater.Perm_AppData" выдал исключение. ---> System.AggregateException: Произо шла одна или несколько ошибок. ---> System.Net.Http.HttpRequestException: Произо шла ошибка при отправке запроса. ---> System.Net.WebException: Удаленный сервер возвратил ошибку: (407) Требуется аутентификация посредника. в System.Net.HttpWebRequest.EndGetRequestStream(IAsyncResult asyncResult, Tra nsportContext& context) в System.Net.Http.HttpClientHandler.GetRequestStreamCallback(IAsyncResult ar)

--- Конец трассировки внутреннего стека исключений --- в Google.Apis.Http.ConfigurableMessageHandler.d__55.MoveNext() --- Конец трассировка стека из предыдущего расположения, где возникло исключение --- в System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) в System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNoti fication(Task task) в Google.Apis.Auth.OAuth2.Requests.TokenRequestExtenstions.d__0 .MoveNext() --- Конец трассировка стека из предыдущего расположения, где возникло исключение --- в System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) в System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNoti fication(Task task) в Google.Apis.Auth.OAuth2.Flows.AuthorizationCodeFlow.d__35. MoveNext() --- Конец трассировка стека из предыдущего расположения, где возникло исключение --- в System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) в System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNoti fication(Task task) в Google.Apis.Auth.OAuth2.Flows.AuthorizationCodeFlow.d__30.MoveNext() --- Конец трассировка стека из предыдущего расположения, где возникло исключение --- в System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) в System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNoti fication(Task task) в Google.Apis.Auth.OAuth2.AuthorizationCodeInstalledApp.d__8. MoveNext() --- Конец трассировка стека из предыдущего расположения, где возникло исключение --- в System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) в System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNoti fication(Task task) в Google.Apis.Auth.OAuth2.GoogleWebAuthorizationBroker.d__4.M oveNext() --- Конец трассировка стека из предыдущего расположения, где возникло исключение --- в System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) в System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNoti fication(Task task) в Google.Apis.Auth.OAuth2.GoogleWebAuthorizationBroker.d__1.M oveNext() --- Конец трассировки внутреннего стека исключений ---
в System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledE xceptions) в System.Threading.Tasks.Task1.GetResultCore(Boolean waitCompletionNotificat ion) в System.Threading.Tasks.Task1.get_Result() в Updater.Perm_AppData.Autorization() в C:\Users\User\Documents\Visual Studio Projects\SMNote\Updater\Classes\API\Perm_AppData.cs:строка 27

I need something like:

WebRequest.DefaultWebProxy.Credentials = CredentialCache.DefaultNetworkCredentials;

I do not get an error if I connect to the Internet without a proxy
Post updated #1: The following code normally passes through the proxy

var request = (HttpWebRequest)WebRequest.Create(link);
request.Credentials = CredentialCache.DefaultCredentials;
request.Proxy.Credentials = CredentialCache.DefaultCredentials;

Therefore, I believe that you need to somehow manually add a proxy to the request for google drive

Post updated #2:
The following code normally passes through the proxy

internal static void DoIt()
{
    try
    {
        var t = DownloadPageAsync();
        Console.WriteLine("Downloading page...");
        Console.WriteLine(t.Result);
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.ToString());
    }
}

private static async Task<string> DownloadPageAsync()
{
    var proxy = WebRequest.DefaultWebProxy;
    proxy.Credentials = CredentialCache.DefaultCredentials;
    var httpClientHandler = new HttpClientHandler()
    {
        Proxy = proxy
    };
    using (HttpClient client = new HttpClient(httpClientHandler))
    {
        using (HttpResponseMessage response = await client.GetAsync("https://mail.ru"))
        {
            using (HttpContent content = response.Content)
            {
                string result = await content.ReadAsStringAsync();
                return result.Substring(0, 50);
            }
        }
    }
}

Answer 1

Google Drive code works fine. Problem is that i have limited access to Proxy. Thanks toJon Skeet that helped to find the problem