public static DelegateDataStreamChannel from(DataStreamChannel channel) {
		return new DelegateDataStreamChannel(channel);
	}
This DataStreamChannel implementation delegates all the actions
except the {@link #endStream()} and {@link #endStream(List)} methods.
And let you know the end of delegated channel with the {@link #isEnd()} method.
ngrinder-runtime/src/main/java/org/ngrinder/http/multipart/DelegateDataStreamChannel.java