BentoML

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Feature request

We should support multipart fields that are optional, and arbitrary multipart fields.

Maybe something like:

@svc.api(..., output=FlexibleMultipart())
def endpoint(input):
    if ...:
        return {}
    else:
        return {programmatic_key: value}

It could look like:

from typing import Optional

@svc.api(..., output=Multipart(field1=Optional[JSON()], field2=Optional[NumpyNdarray()])
def endpoint(input):
    ...

We should also support PEP604

from __futures__ import annotations

@svc.api(input=Multipart(field1=list[JSON()], field2=tuple[NumpyNdarray()], output=...)
def endpoint(input):
	...

@frostming in case you weren't aware