The compression IS happening in Seam. In the GWTService class, the method: | protected boolean shouldCompressResponse(HttpServletRequest request, | HttpServletResponse response, String responsePayload) | anonymous wrote : | * This implementation currently returns true if the response | * string's estimated byte length is longer than 256 bytes. | This is not configurable other than subclassing GWTService. Workaround: In I.E. at least, you can disable HTTP/1.1 and only use HTTP/1.0 so you can see the packets without being compressed. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4110587#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...