AppWebUrl is undefined for using cross-domain library in Provider Hosted App-2016 On-Premise

Question

App is Hosted on IIS below the URL:

https://localhost:44343/Pages/Default.aspx?SPHostUrl=http%3A%2F%2Fecontent&0319c41%2Eecontent%2Eelibrary%2Eapps%2Elocal%2FSharePointApp2%5Fsingeltest.

I have used the below code:

hostweburl =
            decodeURIComponent(
                getQueryStringParameter("SPHostUrl")
        );
        appweburl =
            decodeURIComponent(
                getQueryStringParameter("SPAppWebUrl")
        );

        // resources are in URLs in the form:
        // web_url/_layouts/15/resource
        var scriptbase = hostweburl + "/_layouts/15/";

        // Load the js files and continue to the successHandler
        $.getScript(scriptbase + "SP.RequestExecutor.js", execCrossDomainRequest);
      });