[Python] Is it possible to handle multipart form data fields first then file? [closed]

So I was trying to handle the multipart form data.

The expected workflow:

1. Incoming multipart form data. (2 files, 5 text fields)
2. If a field is missing, reject the request.
3. If all fields exist, save files.

The assumption is listed below:

1. Assume the fields and files order are random
2. File sizes are big (>1 GB)

The frameworks I tried are FastAPI, Express.js (Multer, Busboy), Crow.cpp.

Both of them seem to block and wait for the file saving to be done and perform a checking on fields, which is time-consuming if the requst is bad.

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