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Response headers can be added to Blazor using .NET 6 by using the middleware pipeline in the Startup.cs file.

1. Add the middleware extension for adding response headers:

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using System.Threading.Tasks;

public static class ResponseMiddlewareExtensions
{
    public static IApplicationBuilder UseResponseHeaders(this IApplicationBuilder app)
    {
        return app.Use(async (context, next) =>
        {
            context.Response.Headers.Add("X-Content-Type-Options", "nosniff");
            await next();
        });
    }
}

1. In the Configure method of Startup.cs, add the UseResponseHeaders middleware:

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    // ... other middleware

    app.UseResponseHeaders();

    // ... other middleware
}

This middleware will add the "X-Content-Type-Options" response header with the value "nosniff" to every HTTP response. You can modify the header name and value as needed.

Note: You may need to import the Microsoft.AspNetCore.Http namespace to use the HttpResponse object.