非常感谢所有答案.终于我把它整理好了.请参考下面的修正:

Thanks so much for all the answers. Finally I got it sorted. Please refer to my fix below:

[Route("api/[controller]")]
public class UrlController : Controller
{
    [HttpGet("{*longUrl}")]
    public string ShortUrl(string longUrl)
    {
        var test = longUrl + Request.QueryString;

        return JsonConvert.SerializeObject(GetUrlToken(test));
    }