Xamarin Forms: [UWP] HttpClientHandler Proxy setting not work

Question

I want to access a website via a proxy from Xamarin.Forms UWP app.
I set a proxy for HttpClientHandler, but it goes directly to the website without going through the proxy.

Code - some button clicked code behind event.

    private async void Button_Clicked(object sender, EventArgs e)
    {
        using (HttpClientHandler hander = new HttpClientHandler()
        {
            Proxy = new System.Net.WebProxy
            {
                Address = new Uri(@"http://172.20.90.87:8080"),
                UseDefaultCredentials = false,
                Credentials = new NetworkCredential("******@gs.com", "Password1!")
            },
            UseProxy = true
        })
        {
            using (HttpClient client = new HttpClient(hander))
            {
                var res = await client.GetAsync(@"https://www.google.co.jp");
                lblMessage.Text = await res.Content.ReadAsStringAsync();
            }
        }
    }

===============

Xamarin.Forms 4.8.0.1451

Answer 1

Hello, Welcome to Micorosoft Q&A,

HttpClientHandler Proxy setting not work

Derive from this blog proxy part.

proxy settings are automatically obtained from Internet Explorer/Microsoft Edge settings and are used for all the HTTP calls by default. This enables apps to automatically work even if the user is connected to the internet through a proxy. Neither API provides a way to specify a custom proxy for your app.

So we can't use a custom proxy for a single HTTP request by now. But you are welcome to ask for this feature with Windows Feed Back Hub.

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