Solve CORS Origin Problem: Server-side

controller.cs

[EnableCors("AllowOrigin")]
public class SecurityController : Controller
{
    //....
}

Startup.cs

public void Configure(IApplicationBuilder app, IWebHostEnvironment env, ILoggerFactory loggerFactory)
{
  //....
	app.UseCors("AllowAnyOrigin");
	app.UseCors("AllowOrigin");
	app.UseCors("CorsPolicy");	
	app.UseCors(builder => builder
		//.AllowAnyOrigin()
		.SetIsOriginAllowed(origin => true)
		.AllowAnyMethod()
		.AllowAnyHeader()
		.AllowCredentials());
    //....
}

public void ConfigureServices(IServiceCollection services)
{
    //....
    services.AddCors(options =>
    {
        options.AddPolicy("AllowAnyOrigin", builder => builder.AllowAnyOrigin().AllowAnyHeader().AllowAnyMethod());
        options.AddPolicy("AllowOrigin", builder => builder.AllowAnyOrigin().AllowAnyHeader().AllowAnyMethod());
	options.AddPolicy("CorsPolicy", builder => builder.AllowAnyMethod().AllowAnyHeader().AllowCredentials());
    });
    //....
}