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--ConfigureServices()
services.AddCors( corsOptions => 
                    corsOptions.AddPolicy("MySingleOriginCorsPolicy",builder => 
                        builder.WithOrigins("http://localhost:5001")));

--Configure()                        
app.UseCors("MySingleOriginCorsPolicy");

[EnableCors("MySingleOriginCorsPolicy")]
    public class ValuesController : Controller
    
        [HttpGet]
        [DisableCors]
        public IEnumerable<string> Get()

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            
            app.UseCors(policyBuilder => policyBuilder.WithOrigins("http://localhost:5001"));
            
        }