[HttpGet]
        public IHttpActionResult GetLongLink(string code)
        {
            if (string.IsNullOrWhiteSpace(code))
            {
                return Redirect(Request.RequestUri.AbsoluteUri.ToString() + "Home/Index");//跳轉到Home/index
            }
            var longlink = Redis.GetValue(code).Replace("
 
\"", "");//取出來的帶有\"所以去掉它
            if (string.IsNullOrWhiteSpace(longlink))
            {
                return Json(new { error = 1, msg = "連結已經失效" });
            }
            return Redirect(longlink);
        }


        [HttpGet]
        public IHttpActionResult GetShortLink(string longlink)
        {
            
 
if (string.IsNullOrWhiteSpace(longlink))
            {
                return Json(new { error = 1, msg = "長連結不能為空" });
            }
            if (longlink.IndexOf("http://") != 0 && longlink.IndexOf("https://") != 0)
            {
                return Json(new { error = 1, msg = "長連結格式有誤" });
            }
            
 
var shortCode = Utils.ShortUrl(longlink)[0];//短網址演算法計算出的值拿第一個
            Redis.SetValue(shortCode, longlink, DateTime.Now.AddDays(30));
            var shortlink = Request.RequestUri.Authority.ToString() + "/" + shortCode;//拼接完整的連結（這裡不帶http不過沒啥影響，需要的話也可以拼上去）

            return Json(new { error = 0, msg = "成功", shortlink });
        }