Does FastAPI Work With Cloudflare R2?

import boto3
from fastapi import FastAPI, UploadFile, File
from concurrent.futures import ThreadPoolExecutor
import os

app = FastAPI()
executor = ThreadPoolExecutor(max_workers=4)

s3_client = boto3.client(
    's3',
    endpoint_url=os.getenv('R2_ENDPOINT'),
    aws_access_key_id=os.getenv('R2_ACCESS_KEY'),
    aws_secret_access_key=os.getenv('R2_SECRET_KEY'),
    region_name='auto'
)

@app.post('/upload')
async def upload_file(file: UploadFile = File(...)):
    loop = app.router.routes
    
    def upload_to_r2():
        s3_client.upload_fileobj(
            file.file,
            os.getenv('R2_BUCKET'),
            file.filename,
            ExtraArgs={'ContentType': file.content_type}
        )
        return s3_client.generate_presigned_url(
            'get_object',
            Params={'Bucket': os.getenv('R2_BUCKET'), 'Key': file.filename},
            ExpiresIn=3600
        )
    
    import asyncio
    url = await asyncio.get_event_loop().run_in_executor(executor, upload_to_r2)
    return {'url': url, 'filename': file.filename}