public void ConfigureServices(IServiceCollection services)
{
    //配置跨域处理
    services.AddCors(options =>
    {
        options.AddPolicy("any", builder =>
        {
            builder.AllowAnyOrigin() //允许任何来源的主机访问
            .AllowAnyMethod()
            .AllowAnyHeader()
            .AllowCredentials();//指定处理cookie
        });
    });
}

[Route("api/CookieOne")]
[EnableCors("any")]
public class CookieOneController : Controller
{
    //后台设置Cookie 
    [HttpPut]
    public IActionResult Add()
    {
        ControllerContext.HttpContext.Response.Cookies.Append("name", "中文 ，张三丰");
        return Ok(new { msg = "设置成功" });
    }

    //后台获取Cookie,特别 说明对于基础类型的返回值，默认JQuery的ajax解析失败，最好返回IActionResult 
    [HttpGet]
    public IActionResult Get()
    {
        string result = HttpContext.Request.Cookies["url"];
        return Content(result);
    }
}