if (chunk instanceof HttpChunkTrailer) {
ChannelBuffer trailer = ChannelBuffers.dynamicBuffer(
channel.getConfig().getBufferFactory());
trailer.writeByte((byte) '0');
trailer.writeByte(CR);
trailer.writeByte(LF);
encodeTrailingHeaders(trailer, (HttpChunkTrailer) chunk);
trailer.writeByte(CR);
trailer.writeByte(LF);
return trailer;
} else {