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

//ova linija
    readonly string MyAllowSpecificOrigins = "_myAllowSpecificOrigins";

    public IConfiguration Configuration { get; }

    public void ConfigureServices(IServiceCollection services)
    {
      //ovaj komad
        services.AddCors(options =>
        {
            options.AddPolicy(MyAllowSpecificOrigins,
            builder =>
            {
                builder.WithOrigins("http://example.com",
                                    "http://www.contoso.com")
                                    .AllowAnyHeader()
                                    .AllowAnyMethod();
            });
        });
             //ovaj komad

        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
    }

    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseHsts();
        }

     //ova linija
        app.UseCors(MyAllowSpecificOrigins); 

        app.UseHttpsRedirection();
        app.UseMvc();
    }
}