Hi 
I'm learning the latest and greatest Angular using type script.  I have an 
ajax request that works fine in jQuery.  I'm trying to convert this to a 
post request.  Below are the two calls.  Does anyone see anything that I'm 
doing wrong in the typescript or can help point me in the right direction?

Thanks

1.  Working JQuery:

    var url = "http://bsdevtest2/_layouts/15/GHC.WellnessClasses/ajax.ashx";;

    $.ajax({

        url: url,

        data: {

            Function: "GetClassOfferings",

            Host: "http://bsdevtest2";

        },

        type: 'POST',

        success: function (json) {

            alert(json.Offerings.Host);

        },

        error: function (xhr, err) {


        },

        complete: function () {

           

        }

    });


2. Attempt at Angular Service http post

  getClassOfferings (): Observable <any> {
   //var host = location.protocol + "://" + location.host;
   var host = "http://bsdevtest2";;
   var parameter = JSON.stringify({Function:"GetClassOfferings", Host:host
});
   return this.http.post(AJAX_URL, parameter)
   .pipe(
     tap(Offerings => this.log(`fetched class offerings`)),
     catchError(this.handleError('getClassOfferings', []))
   );
 }

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