@Override
    public HttpStreamDeframer decompressor(@Nullable Decompressor decompressor) {
        return (HttpStreamDeframer) super.decompressor(decompressor);
    }
Sets the deframed {@link StreamMessage}.
Note that the {@code deframedStreamMessage} should be set before processing the first {@link HttpObject}.
grpc/src/main/java/com/linecorp/armeria/internal/common/grpc/HttpStreamDeframer.java