public interface StreamedHttpMessage extends io.netty.handler.codec.http.HttpMessage, Publisher<io.netty.handler.codec.http.HttpContent>
HttpMessage and Publisher into one
 message. So it represents an http message with a stream of HttpContent
 messages that can be subscribed to.
 Note that receivers of this message must consume the publisher,
 since the publisher will exert back pressure up the stream if not consumed.