Click on HTTP Requests in the Left Area to monitor system wide http requests.
To enable other statistical information like Response States, Requested URL extensions, Host Names etc, click on the text on top ("HTTP request statistics are disabled. Click here to enable"). Clicking the same would disable it again.
Please remember to disable statistical data for performance reasons after the end of debugging session.
Following page refresh will update the information.
To clear the statistics and start fresh click on the text ("Click here to clear statistics").