The following publicly cacheable, compressible resources should have a "Vary: Accept-Encoding" header:how do i acchive this? can someone help# http://xxx/Livetest/ig_res/default/ig_monthcalendar.css# http://xxx/Livetest/ig_res/default/ig_panel.css# http://xxx/Livetest/ig_res/default/ig_shared.css# http://xxx/Livetest/ig_res/default/ig_texteditor.css