Why do I get "GET / HTTP/1.1 404 Not Found" with FastAPI server?

I am trying to create a token with FastAPI:

> import json
> import os
> import aiohttp
> import asyncio
> from fastapi import FastAPI
> from fastapi import APIRouter, Request
> from fastapi.responses import JSONResponse
> 
> token = APIRouter(prefix="/management/api", tags=["API Apl token"])
> 
> app=FastAPI()
> app.include_router(token)

and many methods after...

I got this

> uvicorn peg:token --reload
> INFO:     Will watch for changes in these directories: ['C:\\Users\\Ejbc25\\fastapi']
> INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
> INFO:     Started reloader process [2232] using StatReload
> INFO:     Started server process [20632]
> INFO:     Waiting for application startup.
> INFO:     Application startup complete.
> INFO:     127.0.0.1:51183 - "GET / HTTP/1.1" 404 Not Found
> INFO:     127.0.0.1:51183 - "GET / HTTP/1.1" 404 Not Found

How to fix this problem?

I expected that http://127.0.0.1:8000/token would return token but shows

Not Found

Solution

The reason of your issue is that you're trying to run a FastAPI APIRouter instance (token) directly with uvicorn, instead of the actual FastAPI application (app).

Your uvicorn command:

uvicorn peg:token --reload

is trying to start the app using the token router as the main app, which won’t work since token is not a FastAPI application (it’s just a router meant to be included in an app).

You should point uvicorn to the actual FastAPI instance, which in your code is named app. Change your command to:

uvicorn peg:app --reload

Obviously I'm assuming that the your file is named peg.py, but if it has a different name update the command (e.g., uvicorn main:app --reload for main.py).