implementing Async File Upload in FastAPI - how to Use FormData with Async Functions
I'm working on a personal project and I'm prototyping a solution and I need help solving I've looked through the documentation and I'm still confused about I'm currently developing an application using FastAPI, and I'm trying to implement an asynchronous file upload feature using FormData..... However, I'm running into issues where the uploaded file seems to not be processed correctly when trying to access it asynchronously. Here’s the relevant part of my code: ```python from fastapi import FastAPI, File, UploadFile from fastapi.responses import JSONResponse app = FastAPI() @app.post("/upload/") async def upload_file(file: UploadFile = File(...)): try: contents = await file.read() with open(f"uploaded_{file.filename}", "wb") as f: f.write(contents) return JSONResponse(content={"filename": file.filename}) except Exception as e: return JSONResponse(status_code=500, content={"message": str(e)}) ``` When I send a file using a POST request to this endpoint, I get an behavior: `AttributeError: 'NoneType' object has no attribute 'filename'`. It seems that the `file` parameter is not being populated correctly. I have tried using different clients like Postman and cURL, but the scenario continues. My FastAPI version is 0.68.0 and I'm running it with Uvicorn. I’ve double-checked my request payload and ensured that I'm sending the file as form-data, but I still can’t figure out where I’m going wrong. Any insights on how to handle this correctly or why I might be working with this question would be greatly appreciated. I'm working on a web app that needs to handle this. I'd really appreciate any guidance on this. I'm on Windows 10 using the latest version of Python. What would be the recommended way to handle this? I'm developing on Ubuntu 22.04 with Python. Any pointers in the right direction? I'm open to any suggestions. My team is using Python for this application.