I am trying to run a "local" web app on Google Colab using FastAPI / Uvicorn like some of the Flask app sample code I've seen but cannot get it to work. Has anyone been able to do this? Appreciate it.
!pip install FastAPI -q
!pip install uvicorn -q
from fastapi import FastAPI
app = FastAPI()
@app.get("/")
async def root():
return {"message": "Hello World"}
#attempt 1
if __name__ == "__main__":
uvicorn.run("/content/fastapi_002:app", host="127.0.0.1", port=5000, log_level="info")
#attempt 2
#uvicorn main:app --reload
!uvicorn "/content/fastapi_001.ipynb:app" --reload
You can use ngrok to export a port as an external url. Basically, ngrok takes something available/hosted on your localhost and exposes it to the internet with a temporary public URL.
First install the dependencies
!pip install fastapi nest-asyncio pyngrok uvicorn
Create your app
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
app = FastAPI()
app.add_middleware(
CORSMiddleware,
allow_origins=['*'],
allow_credentials=True,
allow_methods=['*'],
allow_headers=['*'],
)
@app.get('/')
async def root():
return {'hello': 'world'}
Then run it down.
import nest_asyncio
from pyngrok import ngrok
import uvicorn
ngrok_tunnel = ngrok.connect(8000)
print('Public URL:', ngrok_tunnel.public_url)
nest_asyncio.apply()
uvicorn.run(app, port=8000)