Access to XMLHttpRequest at https://xxx from origin http://yyy has been blocked by CORS policy

Access to XMLHttpRequest at https://xxx from origin http://yyy has been blocked by CORS policy:

No 'Access-Control-Allow-Origin' header is present on the requested resource.

#region //==< Builder >==

//==< Builder >==

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers();

// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle

builder.Services.AddEndpointsApiExplorer();

builder.Services.AddSwaggerGen();

//*CORS

//< CORS >

//*allow calls from AngularUI

builder.Services.AddCors(options=>options.AddPolicy(name:"FrontendUI",

    policy =>

    {

        policy.WithOrigins("http://localhost:4200").AllowAnyMethod().AllowAnyHeader();

    }

    ));

//</ CORS >

//==</ Builder >==

#endregion //==< Builder >==

#region //==< APP >==

//==< APP >==

var app = builder.Build();

// Configure the HTTP request pipeline.

if (app.Environment.IsDevelopment())

{

    app.UseSwagger();

    app.UseSwaggerUI();

}

//< CORS >

app.UseCors("FrontendUI");

//</ CORS >

app.UseHttpsRedirection();

app.UseAuthorization();

app.MapControllers();

app.Run();

//==</ APP >==

#endregion //==</ APP >==