of various transports such as a NIO Channel .  org.jboss.netty.handler.codec.compression Encoder and decoder which compresses and decompresses ChannelBuffer s in a compression format such as zlib and gzip .  org.jboss.netty.handler.codec.http Encoder, decoder and their related message types for HTTP.  org.jboss.netty.handler.codec.oneone Simplistic abstract classes which help implement encoder and decoder that transform