Blazor - Accessing an API controller endpoint triggers Routes.razor

[mrlife]

Is there an existing issue for this?

• [X] I have searched the existing issues

Describe the bug

In an ASP.NET Core 8 Blazor web app, I have an API controller with the following setup. When the endpoint is accessed, for some reason, Routes.razor is being run (not sure if App.razor is being run prior to that).

Is this the intended behavior, either by default or with my configuration below, or possibly a bug?

MyController.cs

[ApiController]
[Route("api/[controller]")]
public class MyController : ControllerBase
{
    [HttpGet]
    public void MyMethod()
    {
        // code here
    }
}

Here is the related information in Program.cs:

var builder = WebApplication.CreateBuilder(options);
builder.Services.AddControllers();
builder.Services.AddRazorPages().AddRazorRuntimeCompilation();
builder.Services.AddServerSideBlazor();

var app = builder.Build();
app.MapRazorComponents<App>().AddInteractiveServerRenderMode();
app.MapControllers();

Expected Behavior

When accessing an API endpoint, Blazor should not be involved.

Steps To Reproduce

No response

Exceptions (if any)

No response

.NET Version

8.0.204

Anything else?

No response

[mrlife]

Hi @mkArtakMSFT @javiercn, please update the label to https://github.com/dotnet/aspnetcore/labels/area-blazor when you have a chance?

(perhaps, the dotnet-issue-labeler prioritized "API" or "controller" over "Blazor" in the title when determining the label)