public static void releaseBuffer(Object message, RequestContext ctx) {
        final IdentityHashMap<Object, ByteBuf> buffers = ctx.attr(BUFFERS);
        if (buffers == null) {
            return;
        }
        final ByteBuf removed = buffers.remove(message);
        if (removed == null) {
            return;
        }

        removed.release();
    }
Releases the {@link ByteBuf} backing the specified {@link Message}.
grpc/src/main/java/com/linecorp/armeria/unsafe/grpc/GrpcUnsafeBufferUtil.java