Зипованый контент в Java. GZIP.

http://stackoverflow.com/questions/16638345/how-to-decode-gzip-compressed-request-body-in-spring-mvc

http://www.javablog.fr/javaweb-gzip-compression-protocol-http-filter-gzipresponsewrapper-gzipresponsewrapper.html

http://srlawr.blogspot.com/2011/09/creating-custom-filter-in-spring.html