FastAPI with boto3 on Fly.io

app.py

import os
import boto3
from fastapi import FastAPI

S3_URL = os.getenv("AWS_ENDPOINT_URL_S3")
svc = boto3.client('s3', endpoint_url=S3_URL)

app = FastAPI()

@app.get("/")
async def read_root():
    buckets = svc.list_buckets()
    return {"buckets": [bucket["Name"] for bucket in buckets["Buckets"]]}