Default Proxy issues

[IeuanWalker]

Default Proxy issues

Our organisation has a proxy and in previous versions on .NET (.net full framework), you can add the following to the web.config and the application will use your system's default proxy.

<system.net>
   <defaultProxy useDefaultCredentials="true" />
</system.net>

I have tried a lot of different options but just cant seem to get anything to work.

string username = "test";
string password = "test";
WebProxy proxy = new WebProxy($"http://{username}:{password}@bluecoat.domain.gov.uk", 8080)
{
    Address = new Uri("http://{username}:{password}@bluecoat.domain.gov.uk:8080"),
    Credentials = new NetworkCredential(username, password)
};
HttpClientHandler clientHandler = new HttpClientHandler
{
    Proxy = proxy,
    UseProxy = true,
    Credentials = new NetworkCredential(username, password)
};
var httpClient = new HttpClient(clientHandler);

Any help would be greatly appreciated.

[wfurt]

You should not need user & password in Uri. What version of .Net and OS is failing for you?
If the request failing to authenticate or is it not going to proxy at all?

[davidsh]

If you simply want to use the default system proxy and need to pass default credentials to that proxy (because the proxy is an authenticated proxy) during HTTP requests, then do this:

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

// Now use 'client' to do requests.

This assumes that you already have a default system proxy configured on the machine. I.e. on Windows machine you would set up the default system proxy via Internet Explorer settings using 'Automatic' settings or PAC file or explicit settings. For example:

[davidsh]

Also, putting username and password into the Uri itself is a deprecated concept and is ignored in the HTTP stacks of .NET Framework and .NET Core.

WebProxy proxy = new WebProxy($"http://{username}:{password}@bluecoat.domain.gov.uk", 8080)

[weliwita]

I'm also having proxy issues with MacOs.

        static void Main(string[] args)
        {
            HttpClientHandler handler = new HttpClientHandler();
            var client = new HttpClient(handler);
            string baseUrl = "http://www.bbc.com";

            try
            {
                HttpResponseMessage res = client.GetAsync(baseUrl).Result;
                if (res.IsSuccessStatusCode)
                {
                    Console.WriteLine("Success");
                }
                else
                {
                    Console.WriteLine("Failed");
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
        }

This code doesn't respect proxy settings configured on MacOs. Is default proxy is not used by HttpClient or am I missing some configuration? I have also posted this on stackoverflow https://stackoverflow.com/questions/49653986/dotnet-core-httpclient-doesnt-respect-proxy-settings-on-mac

[wfurt]

On OSX You have to "export http_proxy http://proxy.server.com:3128"
curl library we use under the cover does not know how to read system settings.
Future work is tracked in https://github.com/dotnet/corefx/issues/26593

[davidsh]

@IeuanWalker I think your questions about to enable default credentials use for the default system proxy have been answered above. So, we'll close this issue now.