Below is the WSI method:

from __future__ import annotations

~from typing import IO, List, Union import typing as t from io import BytesIO from starlette.requests import Request from multipart.multipart import parse_options_header from starlette.datastructures import UploadFile from bentoml.exceptions import BentoMLException from bentoml._internal.types import FileLike from bentoml.io import File class WSIFile(File): def __new__( # pylint: disable=arguments-differ # returning subclass from new cls, kind = "binaryio", mime_type: str | None = None ) -> File: mime_type = mime_type if mime_type is not None else "application/octet-stream" if kind == "binaryio": res = object.__new__(BytesIOFile) else: raise ValueError(f"invalid File kind '{kind}'") res._mime_type = mime_type return res class BytesIOFile(File): async def from_http_request(self, request: Request) -> IO[bytes]: # return request content_type, _ = parse_options_header(request.headers["content-type"]) if content_type.decode("utf-8") == "multipart/form-data": form = await request.form() found_mimes: List[str] = [] val: Union[str, UploadFile] for val in form.values(): # type: ignore if isinstance(val, UploadFile): found_mimes.append(val.content_type) # type: ignore (bad starlette types) if val.content_type == self._mime_type: # type: ignore (bad starlette types) res = FileLike[bytes](val.file, val.filename) # type: ignore (bad starlette types) break if 'image/' in val.content_type: res = FileLike[bytes](val.file, val.filename) # type: ignore (bad starlette types) break else: if len(found_mimes) == 0: raise BentoMLException("no File found in multipart form") else: raise BentoMLException( f"multipart File should have Content-Type '{self._mime_type}', got files with content types {', '.join(found_mimes)}" ) return res # type: ignore body = await request.body() return t.cast(IO[bytes], FileLike(BytesIO(body), "<request body>"))~ ``````