I am unable to send non JSON Serializable content as response

[ahsanmemon]

I'm trying to send a numpy array back as a response using the following code

return {
    'embeddings': msgpack.packb(np.random.rand(10,100).tobytes())
}

It won't send it. It throws an error saying that "TypeError: Object of type bytes is not JSON serializable"

It's important to send bytes back because it saves up on network load. Need an option to be able to support mimetype='application/msgpack'