Why is sending a GET request not working?

Question

Computer networks

Why when I type in https://helpdesk.domain/api/Task/number in the browser , the result is displayed as it should, but when in my program

WebRequest req = WebRequest.Create("https://helpdesk.домен/api/Task/номер");
            //ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
            req.Credentials = new NetworkCredential("Логин", "пароль");
            WebResponse resp = req.GetResponse();
            Stream stream = resp.GetResponseStream();
            StreamReader sr = new StreamReader(stream);
            string Out = sr.ReadToEnd();
            sr.Close();
            Console.WriteLine(Out);
            Console.ReadLine();

then he writes to me

Удаленный сервер возвратил ошибку: (400) Недопустимый запрос."

How is it invalid if I send essentially the same GET request?

Answer 1

open chrome
press F12
go to network section
now submit your request in chrome
see what the headers were in the request
maybe something needs to be added