Blazor web app ASP.NET Core 8.0 controller not finding route

How to use controllers in a Blazor web app? My route is not being found.

local host page can't be found

file folder structure

I have AddControllers and MapControllers in my program.cs.

I want to be able to add a simple route to this controller so I can test how to download files, but I am unable to route to this controller when I type into the url.

I am not sure what I am missing or how to get the controller to be called. I have done the map and add controllers which has not brought anything.

using Microsoft.AspNetCore.Mvc;using System.IO.Compression;namespace SecureFileShare.Controllers{    public class HomeController : ControllerBase    {        [ApiController]        [Route("api/[controller]")]        public class FilesController : ControllerBase        {            private readonly IWebHostEnvironment _hostEnvironment;            public FilesController(IWebHostEnvironment hostEnvironment)            {                _hostEnvironment = hostEnvironment;            }            [HttpGet]            [Route("download-zip")]            public IActionResult DownloadFiles()            {                try                {                    var folderPath = Path.Combine(_hostEnvironment.ContentRootPath, "FilesToDownload");                    // Ensure the folder exists                    if (!Directory.Exists(folderPath))                        return NotFound("Folder not found.");                    // Get a list of files in the folder                    var files = Directory.GetFiles(folderPath);                    if (files.Length == 0)                        return NotFound("No files found to download.");                    // Create a temporary memory stream to hold the zip archive                    using (var memoryStream = new MemoryStream())                    {                        // Create a new zip archive                        using (var zipArchive = new ZipArchive(memoryStream, ZipArchiveMode.Create, true))                        {                            foreach (var file in files)                            {                                var fileInfo = new FileInfo(file);                                // Create a new entry in the zip archive for each file                                var entry = zipArchive.CreateEntry(fileInfo.Name);                                // Write the file contents into the entry                                using (var entryStream = entry.Open())                                using (var fileStream = new FileStream(file, FileMode.Open, FileAccess.Read))                                {                                    fileStream.CopyTo(entryStream);                                }                            }                        }                        memoryStream.Seek(0, SeekOrigin.Begin);                        // Return the zip file as a byte array                        return File(memoryStream.ToArray(), "application/zip", "files.zip");                    }                }                catch (Exception ex)                {                    return StatusCode(500, $"An error occurred: {ex.Message}");                }            }        }    }}

using SecureFileShare.Client.Pages;using SecureFileShare.Components;using Microsoft.AspNetCore.Authentication.Negotiate;using Microsoft.AspNetCore.Components.Server.Circuits;using Microsoft.Extensions.DependencyInjection.Extensions;using SecureFileShare.Services;var builder = WebApplication.CreateBuilder(args);// For windows authentication // ---------------------// First add nuget package Microsoft.AspNetCore.Authentication.Negotiatbuilder.Services.AddAuthentication(NegotiateDefaults.AuthenticationScheme)   .AddNegotiate();builder.Services.AddAuthorization(options =>{    options.FallbackPolicy = options.DefaultPolicy;});// Add services to the container.builder.Services.AddRazorComponents()    .AddInteractiveServerComponents()    .AddInteractiveWebAssemblyComponents();// Inject IHttpContextAccessorbuilder.Services.AddHttpContextAccessor();// Injectsbuilder.Services.AddScoped<UserService>();builder.Services.TryAddEnumerable(    ServiceDescriptor.Scoped<CircuitHandler, UserCircuitHandler>());builder.Services.AddControllers();  ///I ADDED CONTROLLER HEREvar app = builder.Build();// Configure the HTTP request pipeline.if (app.Environment.IsDevelopment()){    app.UseWebAssemblyDebugging();}else{    app.UseExceptionHandler("/Error", createScopeForErrors: true);    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.    app.UseHsts();}app.UseHttpsRedirection();app.UseStaticFiles();app.UseAntiforgery();///app.UseAuthentication();app.UseAuthorization();///app.MapRazorComponents<App>()    .AddInteractiveServerRenderMode()    .AddInteractiveWebAssemblyRenderMode()    .AddAdditionalAssemblies(typeof(SecureFileShare.Client._Imports).Assembly);app.MapControllers();   ///I MAPPED CONTROLLER HEREapp.Run();