.NET Maui Aspire integration not resolving ASP.NET Core Web API

Question

I am trying to use the new .NET Maui Aspire integration to make my development life easier and I cannot get the service discovery to work where the app detects the API's URL. I'm following this https://learn.microsoft.com/en-us/dotnet/maui/data-cloud/aspire-integration?view=net-maui-10.0

This is my AppHost.cs file:

var builder = DistributedApplication.CreateBuilder(args);

var api = builder.AddProject("webapi", @"../My.Api/My.Api.csproj");

var publicDevTunnel = builder.AddDevTunnel("devtunnel-public")
    .WithAnonymousAccess() // All ports on this tunnel default to allowing anonymous access
    .WithReference(api.GetEndpoint("https"));

var mauiApp = builder
    .AddMauiProject("MyApp", @"../My.App/My.App.csproj");

// Add Android emulator with default emulator (uses running or default emulator)
mauiApp
    .AddAndroidEmulator()
    .WithOtlpDevTunnel() // Required for OpenTelemetry data collection
    .WithReference(api, publicDevTunnel);

builder.Build().Run();

And in my app, I have:

public static MauiApp CreateMauiApp()
{
    var builder = MauiApp.CreateBuilder();
    builder
        .UseMauiApp<App>()
        .ConfigureFonts(fonts => { fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular"); });

    // Add service defaults & Aspire components.
    builder.AddServiceDefaults();

    // HttpClients
    builder.Services.AddHttpClient<DeviceApiClient>(client =>
        {
            // Service name matches the name used in App Host
            client.BaseAddress = new Uri("https+http://webapi");
        });
    builder.Services.AddHttpClient<UserApiClient>(client =>
        {
            // Service name matches the name used in App Host
            client.BaseAddress = new Uri("https+http://webapi");
        });

    builder.Services.AddAuthorizationCore();
    builder.Services.AddMauiBlazorWebView();
    builder.Services.AddMudServices();
        
#if DEBUG
    builder.Services.AddBlazorWebViewDeveloperTools();
    builder.Logging.AddDebug();
#endif
    
    return builder.Build();
}

The Aspire solution runs as expected and I can start the Android app from the Aspire dashboard, but the app is not resolving the Web API url.

public class DeviceApiClient(HttpClient httpClient)
{
    public async Task CheckDeviceRegistration(SettingsService.DeviceVerificationRequest request)
    {          
        var result = await httpClient.PostAsJsonAsync("api/facility/devices/verify", request);
        result.EnsureSuccessStatusCode();
    }
}

In this call the httpClient's base address is resolving to https://webapi/api/facility/devices/verify.

I have two ServiceDefaults, one for the Maui app and one for the Web API.

I realise this is in preview, so not 100% completed yet, but I have seen others be able to do this, so I'm hoping it's something silly I've misconfigured.

Andrew Shaw · Accepted Answer · 2025-11-19 08:58:21Z

0

The issue seems to be related to older packages I had installed, particularly

<PackageReference Include="Microsoft.Extensions.ServiceDiscovery" Version="10.0.0" />
<PackageReference Include="OpenTelemetry.Exporter.Console" Version="1.14.0-rc.1" />
<PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.14.0" />
<PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.14.0-rc.1" />

Removing these creates a new error, but will raise separately

answered Nov 19 at 8:58

Andrew Shaw

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