public async Task<string> getWebTitle(string webUrl, string usr, string psw)
        {
            //Creating Password
            const string PWD = psw;
            const string USER = usr;
            const string RESTURL = "{0}/_api/web?$select=Title";

            //Creating Credentials
            var passWord = new SecureString();
            foreach (var c in PWD) passWord.AppendChar(c);
            var credential = new SharePointOnlineCredentials(USER, passWord);


            //Creating Handler to allows the client to use credentials and cookie
            using (var handler = new HttpClientHandler() { Credentials = credential })
            {
                //Getting authentication cookies
                Uri uri = new Uri(webUrl);
                handler.CookieContainer.SetCookies(uri, credential.GetAuthenticationCookie(uri));

                //Invoking REST API
                using (var client = new HttpClient(handler))
                {
                    client.DefaultRequestHeaders.Accept.Clear();
                    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

                    HttpResponseMessage response = await client.GetAsync(string.Format(RESTURL, webUrl)).ConfigureAwait(false);
                    response.EnsureSuccessStatusCode();

                    string jsonData = await response.Content.ReadAsStringAsync();


                    return jsonData;

                }
            }
        }