Program.cs

using Admin_Console.Data;
using Admin_Console.Models;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.HttpOverrides;
using Microsoft.EntityFrameworkCore;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
var identityConnectionString = builder.Configuration.GetConnectionString("AdminIdentityConnection");
var tcuConnectionString = builder.Configuration.GetConnectionString("TcuServerConnection");

builder.Services.AddDbContext<ApplicationDbContext>(options =>
    options.UseNpgsql(identityConnectionString));

builder.Services.AddDbContext<BackEndApplicationDbContext>(options =>
    options.UseNpgsql(tcuConnectionString));

builder.Services.AddDbContext<TCUContext>(options =>
    options.UseNpgsql(tcuConnectionString));

builder.Services.AddControllers().AddNewtonsoftJson(options =>
    options.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore
);

builder.Services.AddDatabaseDeveloperPageExceptionFilter();

builder.Services.AddDefaultIdentity<ApplicationUser>(options => options.SignIn.RequireConfirmedAccount = true)
    .AddEntityFrameworkStores<ApplicationDbContext>();

builder.Services.AddIdentityCore<BackEndApplicationUser>()
                .AddEntityFrameworkStores<BackEndApplicationDbContext>();

builder.Services.AddIdentityServer().AddApiAuthorization<ApplicationUser, ApplicationDbContext>();


builder.Services.AddAuthentication().AddIdentityServerJwt();

builder.Services.AddControllersWithViews();
builder.Services.AddRazorPages();
var app = builder.Build();

var forwardOptions = new ForwardedHeadersOptions
{
    ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto,
    RequireHeaderSymmetry = false
};

forwardOptions.KnownNetworks.Clear();
forwardOptions.KnownProxies.Clear();
app.UseForwardedHeaders(forwardOptions);

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseMigrationsEndPoint();
}
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.UseStaticFiles();
app.UseRouting();

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

app.MapControllerRoute(
    name: "default",
    pattern: "{controller}/{action=Index}/{id?}");
app.MapRazorPages();

app.MapFallbackToFile("index.html"); ;

app.Run();