yaflay.ru/Controllers/HomeController.cs

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using System.Net;
using System.Net.Http.Headers;
using System.Text;
using System.Text.Json.Nodes;
using System.Xml.Schema;

namespace yaflay.ru.Новая_папка
{
    [Route("")]
    public class HomeController : Controller
    {
        // GET: HomeController

        private async Task<string> getUrlFromGit(string baseUrl)
        {
            try
            {
                HttpClient client = new();
                HttpResponseMessage getter = await client.GetAsync("https://raw.githubusercontent.com/YaFlay/yaflay.ru/master/redirect_uris.json");
                await Console.Out.WriteLineAsync(await getter.Content.ReadAsStringAsync());
                JsonNode allFile = JsonNode.Parse(await getter.Content.ReadAsStringAsync());
                return (string?)allFile[baseUrl];
            }
            catch (Exception except)
            {
                await Console.Out.WriteLineAsync(except.ToString());
                return null;
            }
        }
        // GET: HomeController/Details/5
        [HttpGet("/{uri}")]
        public async Task<IActionResult> fromGitHub(string? uri)
        {
            if (uri == null) { return View("Index.cshtml"); }
            string? url = await getUrlFromGit(uri);

            return Redirect(url != null ? url : "https://yaflay.ru/");
        }

        // GET: HomeController/Create
    }
}