.netcore3.1 设置可跨域

所有终端都可以调用，代码如下：

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    // Preceding code ommitted.
    app.UseRouting();

    app.UseCors();

    app.UseEndpoints(endpoints =>
    {
        endpoints.MapControllers();
    });

    // Following code ommited.
}