How to implement guide with asynchronous file uploads in fastapi - receiving 422 unprocessable entity scenarios
I'm sure I'm missing something obvious here, but I'm currently building a FastAPI application that allows users to upload files asynchronously... However, when I attempt to upload a file, I'm working with a `422 Unprocessable Entity` behavior. I have set up a simple endpoint that should handle the file upload, but it seems like FastAPI isn't recognizing the request correctly. Here’s the relevant part of my code: ```python from fastapi import FastAPI, File, UploadFile from fastapi.responses import HTMLResponse app = FastAPI() @app.post("/uploadfile/") async def upload_file(file: UploadFile = File(...)): contents = await file.read() return {"filename": file.filename, "content_size": len(contents)} ``` And here's how I'm making the request using `requests` library in Python: ```python import requests url = 'http://127.0.0.1:8000/uploadfile/' files = {'file': ('test.txt', open('test.txt', 'rb'))} response = requests.post(url, files=files) print(response.json()) ``` I have confirmed that the file 'test.txt' exists and is being opened correctly. Additionally, I’m running FastAPI version 0.68.0 and Python 3.9.7. The behavior seems to suggest that the payload is not being processed correctly, but I need to figure out why. I’ve tried adjusting the file name in the request and ensured that the endpoint matches exactly, but the question continues. What steps can I take to troubleshoot this scenario further? How would you solve this?