How to make a “webhook”?

Question

I need the "WinForm" application for correspondence in viber.

"Webhook" is planned to receive data (events) from viber, then the data will be used in the application "WinForm".

 

I did:

1. created the project "ASP.NET Web Application (.NET Framework)";
2. chose a template - "Empty" + "MVC" + "API";
3. added controller "Controller MVC 5 - empty". Controller name "HookController";
4. I run the application "Postman";
5. "Postman". I set the request "POST";
6. "Postman". I set the link http://localhost:44836/Hook;
7. "Postman". Click "SEND";
8. The result, see the picture "- = RESULT = -";
   

If I understand the theory correctly, then after performing the "Postman" action. I click "SEND", the ViberProcess (HttpContext context) method should be executed in the HookController.cscontroller and the code should stop at the breakpoint.

 

This is not happening.

 

Documentation Viber REST API - link

 

Question.

 

How to make a Webhook?

Code HookController.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Mvc;

//
using System.Runtime.Remoting.Contexts;

namespace WebAppl1.Controllers
{
    public class HookController : Controller
    {
        // GET: Hook
        //public ActionResult Index()
        //{
        //    return View();
        //}

         [HttpPost]
        // [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public void ViberProcess(HttpContext context)
        {
            try
            {
                Stream s = context.Request.InputStream;
                // Stream s = Context.Request.InputStream;
                // or  Stream s  = HttpContext.Current.Request.InputStream;
                s.Position = 0;
                StreamReader reader = new StreamReader(s);
                string jsonText = reader.ReadToEnd();

                // Other code that converts json text to classes
            }
            catch (Exception e)
            {
                // .....
            }
        }
    }
}

 

 

7. "Postman". Click "SEND";

 
 
8. The result, see the picture "- = RESULT = -"; 

 

 

 

Server error in application '/'. Could not find this resource. Description: HTTP 404. The resource (or one of its dependencies) may have been deleted, received a different name, or may be temporarily unavailable. Review the following URL and verify that it is correct. Requested URL: / Hook Version Information: Microsoft .NET Framework Version 4.0.30319; ASP.NET version: 4.7.3062.0