c# - getting security warning in facebook authentication -

i getting security warning while using authentication in facebook app.my code shown screenshot security warning

private void imagefacebook_tap(object sender, gestureeventargs e) {     facebookblocker.visibility = visibility.visible;     pop_up.isopen = true;      //get facebook     string appid = "my facebook app id";      var parameters = new dictionary<string, object>();     parameters["client_id"] = appid;     parameters["redirect_uri"] = "https://www.facebook.com/connect/login_success.html";     parameters["response_type"] = "token";      parameters["display"] = "touch";      string extendedpermissions = "user_about_me,read_stream,publish_stream";      // add 'scope' if have extendedpermissions.     if (!string.isnullorempty(extendedpermissions))     {         // comma-delimited list of permissions         parameters["scope"] = extendedpermissions;     }      var oauth = new facebookoauthclient();     //create login url     var loginurl = oauth.getloginurl(parameters);      ////open facebook login page browser                          _webbrowser.navigate(loginurl);             } 

i have resolved.check answer here. escape facebook security warning

also replace http: https: in facebook graphapi.