MapFallback catch all requests to API controller when ConsumeAttribute added

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

Hello. In .net 6 behavior of MapFallback broke when ConsumesAttribute was added. MapFallback catch all requests to API controller. In .net 6 index.html file always returns on requests to API controller but if I remove endpoints.MapFallbackToFile or delete ConsumesAttribute filter then everything works as I expected. In .net 5 the example works correctly.

ConsumesAttribute was added for the correct generation of swagger.json by Swashbuckle in order not to add it to every action or controller.

Expected Behavior

Requests to controllers must not be catched by MapFallback.

Steps To Reproduce

    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllers(options => options.Filters.Add(new ConsumesAttribute("application/json")));
        }
        public void Configure(IApplicationBuilder app)
        {
            app.UseRouting();
            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
                endpoints.MapFallbackToFile("index.html");
            });
        }
    }

Exceptions (if any)

No response

.NET Version

6.0.200

Anything else?

No response

[msftbot[bot]]

Thanks for contacting us. We’re moving this issue to the .NET 7 Planning milestone for future evaluation / consideration. Because it’s not immediately obvious that this is a bug in our framework, we would like to keep this around to collect more feedback, which can later help us determine the impact of it. We will re-evaluate this issue, during our next planning meeting(s). If we later determine, that the issue has no community involvement, or it’s very rare and low-impact issue, we will close it - so that the team can focus on more important and high impact issues. To learn more about what to expect next and how this issue will be handled you can read more about our triage process here.

[javiercn]

@davidfowl absolutely.

@MackinnonBuck can you take care of it?