issue found in a stream-based transport such as TCP/IP. io.netty.handler.codec.compression Encoder and decoder which compresses and decompresses ByteBuf s in a compression format such as zlib and gzip . io.netty.handler.codec.http.websocketx Encoder, decoder, handshakers and their related message types for Web Socket data frames. io.netty.handler.codec.spdy Encoder, decoder, session handler and their related