CODEWITHSUNDEEP
c#xamarinxamarin.formsxamarin.android
ChrisB
ChrisB

Reputation: 55

HttpClient not working on android

I'm making Xamarin.Forms app which should get JSON from api and then allow to display it. My code so far:

    public async void jsonDownload()
    {
        connect();
        await downloadData();


    }
    public void connect()
    {
        client = new HttpClient();
        client.MaxResponseContentBufferSize = 256000;
    }
    public async Task<List<Jsonclass>> downloadData()
    {

        String url = "https://my-json-server.typicode.com/kgbzoma/TestJsonFile/all";
        var uri = new Uri(string.Format(url, string.Empty));
        try
        {

            var response = await client.GetAsync(uri).ConfigureAwait(false);
            response.EnsureSuccessStatusCode(); //NEVER GET HERE

            var content = await response.Content.ReadAsStringAsync().ConfigureAwait(false); 
            List = JsonConvert.DeserializeObject<List<Jsonclass>>(content);

        }catch (Exception ex)
        {
            Debug.WriteLine(@"     Error {0}", ex.Message);
        }
        return List;
    }

Problem is that code don't even go to response.EnsureSuccessStatusCode(); so my list of objects is empty. On UWP version it's working without any problems. Here i'm gettin exception: System.Net.Http.HttpRequestException with message An error occurred while sending the request.

Upvotes: 4

Views: 7095

Answers (1)

SushiHangover
SushiHangover

Reputation: 74194

SecureChannelFailure (The authentication or decryption has failed.)

or

System.Net.WebException: Error: TrustFailure

or

Mono.Security.Protocol.Tls.TlsException: Invalid certificate received from server.

By default, Xamarin.Android uses the older Mono Managed HttpClient handler that does not support TLS 1.2.

Open your Xamarin.Android project settings, goto Build / Android Build / General and use the AndroidClientHandler.

enter image description here

This will add the following MSBuild properties directly to your .csproj

<AndroidHttpClientHandlerType>Xamarin.Android.Net.AndroidClientHandler</AndroidHttpClientHandlerType>
<AndroidTlsProvider>btls</AndroidTlsProvider>

Note: If doing this manually in the .csproj, you need to add them to the debug AND release PropertyGroup.

Or programmatically set the HttpClient to use it:

client = new HttpClient(new AndroidClientHandler());

Note: You should be looking at the InnerException for these types of errors

catch (Exception ex)
{
    Console.WriteLine(@"     Error {0}", ex.Message);
    Console.WriteLine(@"     Error {0}", ex.InnerException?.Message);
}

Upvotes: 7

Related Questions