The simplest API that expects an image and a string fails wh BentoML #ask-for-help

The simplest API that expects an image and a strin...

Toke Emil Heldbo Reines

06/05/2025, 5:30 AM

The simplest API that expects an image and a string fails when provided a string with a number in it. Sample API:

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@bentoml.service
class Service:
    @bentoml.api
    def classify(self, input_image: PILImage.Image, uid: str) -> Any:
        print(uid)

Call it in the swagger docs with any number and it fails. Call it with curl with the uid being an explicit string and it still fails.

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curl -X 'POST' \
  '<http://localhost:3000/classify>' \
  -H 'accept: application/json' \
  -H 'Content-Type: multipart/form-data' \
  -F 'input_image=@sample_image.png;type=image/png' \
  -F 'uid="1231231231232131313212312312321123123213312";type=application/json'

How do I fix that so it sees it as an actual string in all cases, no typecasting cutting off decimals etc?

Jian Shen Yap

06/05/2025, 5:40 AM

what is the returned error?

Toke Emil Heldbo Reines

06/05/2025, 5:41 AM

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File "/home/tokereines/unumed/xray/.venv/lib/python3.10/site-packages/_bentoml_impl/server/app.py", line 642, in api_endpoint_wrapper
    resp = await self.api_endpoint(name, request)
  File "/home/tokereines/unumed/xray/.venv/lib/python3.10/site-packages/_bentoml_impl/server/app.py", line 706, in api_endpoint
    input_data = await method.input_spec.from_http_request(request, serde)
  File "/home/tokereines/unumed/xray/.venv/lib/python3.10/site-packages/_bentoml_sdk/io_models.py", line 213, in from_http_request
    return await serde.parse_request(request, t.cast(t.Type[IODescriptor], cls))
  File "/home/tokereines/unumed/xray/.venv/lib/python3.10/site-packages/_bentoml_impl/serde.py", line 227, in parse_request
    return cls.model_validate(data)
  File "/home/tokereines/unumed/xray/.venv/lib/python3.10/site-packages/pydantic/main.py", line 596, in model_validate
    return cls.__pydantic_validator__.validate_python(
pydantic_core._pydantic_core.ValidationError: 1 validation error for Input
uid
  Input should be a valid string [type=string_type, input_value=1231231231232131313212312312321123123213312, input_type=int]
    For further information visit <https://errors.pydantic.dev/2.9/v/string_type>

Toke Emil Heldbo Reines

06/05/2025, 6:42 AM

Any idea?

Jian Shen Yap

06/05/2025, 7:21 AM

let me discuss this with the team

👍 1

Jian Shen Yap

06/05/2025, 9:17 AM

the issue lies in curl.. not on bentoml.

Copy code

curl -X 'POST' \
  '<http://localhost:3000/classify>' \
  -H 'accept: application/json' \
  -H 'Content-Type: multipart/form-data' \
  -F 'input_image=@sample_image.png;type=image/png' \
  -F 'uid="\"123456\"";type=application/json'

this works

Toke Emil Heldbo Reines

06/05/2025, 9:38 AM

So the swagger docs is also broken 😕 Sucks that one has to add escape characters even with python requests it seems.

Toke Emil Heldbo Reines

06/05/2025, 9:38 AM

But ty for resolving

Frost Ming

06/05/2025, 3:41 PM

what is the curl command if you wrap the string with double quotes in the input box

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