HTTP Post with Json parameters

Hi All

Can you assist me(new to http) with this code.  I dont get a response.  What 
am I doing wrong.

procedure TForm1.Button1Click(Sender: TObject);
  HTTPClient : TIdHTTP;
  Params : TStringList;
  UrlStr, Response : String;
  JsonResponse : TStringStream;
  HTTPClient := TIdHTTP.Create(nil);
  Params := TStringList.Create;
  JsonResponse := TStringStream.Create();
   Params.Text := '{"TillNo":1,"OperatorCode":1234,"ReceiptType":"String"}';
   UrlStr := EditUrl.Text + 'AirtimeRequest';
   HTTPClient.Post(urlStr, params, JsonResponse);
   on E: EIdHTTPProtocolException do begin


7/3/2014 3:15:07 PM
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Hi All Can you assist me(new to http) with this code. I dont get a response. What am I doing wrong. Sorry for the double post I put this message in the wrong group. procedure TForm1.Button1Click(Sender: TObject); var HTTPClient : TIdHTTP; Params : TStringList; UrlStr, Response : String; JsonResponse : TStringStream; begin HTTPClient := TIdHTTP.Create(nil); Params := TStringList.Create; JsonResponse := TStringStream.Create; try Params.Text := '{"TillNo":1,"OperatorCode":1234,"ReceiptType":"String"}'; U...

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