Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.IdentityModel.Tokens;
using Microsoft.EntityFrameworkCore;
using Microsoft.AspNetCore.SpaServices.ReactDevelopmentServer;
using Raist.Data;

namespace Raist
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            var key = Encoding.ASCII.GetBytes(Configuration.GetValue<string>("SecretKey"));

            services.AddAuthentication(x =>
            {
                x.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
                x.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
            }).AddJwtBearer(x =>
            {
                x.RequireHttpsMetadata = false;
                x.SaveToken = true;
                x.TokenValidationParameters = new TokenValidationParameters
                {
                    ValidateIssuerSigningKey = true,
                    IssuerSigningKey = new SymmetricSecurityKey(key),
                    ValidateIssuer = false,
                    ValidateAudience = false
                };
            });

            services.AddMvc(option => option.EnableEndpointRouting = false);

            // // In production, the React files will be served from this directory
            services.AddSpaStaticFiles(configuration =>
            {
                configuration.RootPath = "ClientApp/build";
            });

             services.AddEntityFrameworkNpgsql().AddDbContext<ClinicaContext>(options =>
                options.UseNpgsql(Configuration.GetConnectionString("DefaultConnection")));

        }

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

            app.UseAuthorization();
             
             app.UseAuthentication();

             app.UseHttpMethodOverride();

             app.UseStaticFiles();
             app.UseSpaStaticFiles();

             app.UseMvc(routes =>
             {
                 routes.MapRoute(
                     name: "default",
                     template: "{controller}/{action=Index}/{id?}");
             });

             app.UseSpa(spa =>
             {
                 spa.Options.SourcePath = "ClientApp";

                 if (env.IsDevelopment())
                 {
                     spa.UseReactDevelopmentServer(npmScript: "start");
                 }
             });
            // app.UseEndpoints(endpoints =>
            // {
            //     endpoints.MapControllers();
            // });
            app.UseMvc();
        }
    }
}