Webapi hides angular routes

See more:

WebAPI

Angular5

.Net-Core2

I'm trying to build a .Net Core 2 WebAPI/Angular hybrid app. I've followed a tutorial and successfully got it serving up the root of the client angular application, and routing within the client app works. However, if I try to navigate directly to a route (for example, "/register") using the browser's address bar, I get a 404. It seems like the WebAPI is attempting to process the request, and failing, as the controllers only have "/api/[controller]/[action]" routes. I'm using attribute-based routing. If it helps, here's my startup.cs file:

using System;
using System.Net;
using System.Text;
using AutoMapper;
using FluentValidation.AspNetCore;
using Io.BLL.Services.Impl.Auth;
using Io.BLL.Services.Interfaces.Auth;
using Io.Data;
using Io.Data.Entities;
using Io.Models.Auth;
using Io.Web.Extensions;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Diagnostics;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Microsoft.IdentityModel.Tokens;

namespace Io.Web
{
    public class Startup
    {
        public IConfiguration Configuration { get; }

        private const string SecretKey = "iNivDmHr2E5Q6V3qvnqycprdRj1PVkH";
        private readonly SymmetricSecurityKey _signingKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes(SecretKey));

        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddDbContext<Context>(options =>
                options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection"),
                b => 
                    b.MigrationsAssembly("Io.Web")));

            services.AddSingleton<IJwtFactory, JwtFactory>();

            // Register the ConfigurationBuilder instance of FacebookAuthSettings
            services.Configure<FacebookAuthSettings>(Configuration.GetSection(nameof(FacebookAuthSettings)));

            services.TryAddTransient<IHttpContextAccessor, HttpContextAccessor>();

            // jwt wire up
            // Get options from app settings
            var jwtAppSettingOptions = Configuration.GetSection(nameof(JwtIssuerOptions));

            // Configure JwtIssuerOptions
            services.Configure<JwtIssuerOptions>(options =>
            {
                options.Issuer = jwtAppSettingOptions[nameof(JwtIssuerOptions.Issuer)];
                options.Audience = jwtAppSettingOptions[nameof(JwtIssuerOptions.Audience)];
                options.SigningCredentials = new SigningCredentials(_signingKey, SecurityAlgorithms.HmacSha256);
            });

            var tokenValidationParameters = new TokenValidationParameters
            {
                ValidateIssuer = true,
                ValidIssuer = jwtAppSettingOptions[nameof(JwtIssuerOptions.Issuer)],

                ValidateAudience = true,
                ValidAudience = jwtAppSettingOptions[nameof(JwtIssuerOptions.Audience)],

                ValidateIssuerSigningKey = true,
                IssuerSigningKey = _signingKey,

                RequireExpirationTime = false,
                ValidateLifetime = true,
                ClockSkew = TimeSpan.Zero
            };

            services.AddAuthentication(options =>
            {
                options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
                options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;

            }).AddJwtBearer(configureOptions =>
            {
                configureOptions.ClaimsIssuer = jwtAppSettingOptions[nameof(JwtIssuerOptions.Issuer)];
                configureOptions.TokenValidationParameters = tokenValidationParameters;
                configureOptions.SaveToken = true;
            });

            // api user claim policy
            services.AddAuthorization(options =>
            {
                options.AddPolicy("ApiUser", policy => 
                    policy.RequireClaim(JwtFactory.Rol, JwtFactory.ApiAccess));
            });

            // add identity
            var builder = services.AddIdentityCore<AppUser>(o =>
            {
                // configure identity options
                o.Password.RequireDigit = false;
                o.Password.RequireLowercase = false;
                o.Password.RequireUppercase = false;
                o.Password.RequireNonAlphanumeric = false;
                o.Password.RequiredLength = 6;
            });
            builder = new IdentityBuilder(builder.UserType, typeof(IdentityRole), builder.Services);
            builder.AddEntityFrameworkStores<Context>().AddDefaultTokenProviders();

            services.AddAutoMapper();
            services.AddMvc().AddFluentValidation(fv => fv.RegisterValidatorsFromAssemblyContaining<Startup>());

            services.AddScoped<IAuthService, AuthService>();
            services.AddScoped<JwtIssuerOptions>();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
                app.UseDeveloperExceptionPage();

            app.UseExceptionHandler(builder =>
            {
                builder.Run(
                    async context =>
                    {
                        context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
                        context.Response.Headers.Add("Access-Control-Allow-Origin", "*");

                        var error = context.Features.Get<IExceptionHandlerFeature>();
                        if (error != null)
                        {
                            context.Response.AddApplicationError(error.Error.Message);
                            await context.Response.WriteAsync(error.Error.Message).ConfigureAwait(false);
                        }
                    });
            });

            app.UseAuthentication();
            app.UseDefaultFiles();
            app.UseStaticFiles();
            app.UseMvc();
        }
    }
}

Thanks for your time and your help!

What I have tried:

CRUD USING .NET CORE 1.0, ANGULAR V2, WEBAPI[^]