FastAPI with uvicorn getting 404 Not Found error

Question

I'm trying (failing) to set up a simple FastAPI project and run it with uvicorn. This is my code:

from fastapi import FastAPI

app = FastAPI()

app.get('/')

def hello_world():
    return{'hello':'world'}

app.get('/abc')

def abc_test():
    return{'hello':'abc'}

This is what I run from the terminal:

PS C:\Users\admin\Desktop\Self pace study\Python\Dev\day 14> uvicorn server2:app   
INFO:     Started server process [3808]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO:     127.0.0.1:60391 - "GET / HTTP/1.1" 404 Not Found
INFO:     127.0.0.1:60391 - "GET /favicon.ico HTTP/1.1" 404 Not Found

As you see, I get a 404 Not found. What could be the reason? Some network-related stuff, possibly firewall/vpn blocking this connection or something else? I'm new to this. Thanks in advance!

Answer 1

You need to use a decorator like this: @app.get('/'). Take a look at the FastAPI Docs.

Additionally, take a look at how decorators work in general to get a better idea of how things work behind the scenes.

Some resources for you:

python docs

one of many articles I was able to find

another SO question

Answer 2

By now you'd probably have figured it out. In order to get MWE running, you'd use the microservice's endpoint decorators before each function definition. The following snippet should get your issue solved. It assumes that you have the following structure:

.
+-- main.py
+-- static
|   +-- favicon.ico
+-- templates
|   +-- index.html

from fastapi import FastAPI
from fastapi.responses import HTMLResponse, FileResponse
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates
import os

app = FastAPI()

app.mount("/static", StaticFiles(directory="static"), name="static")

templates = Jinja2Templates(directory="templates")

@app.get('/')
def hello_world():
    return{'hello':'world'}

@app.get('/favicon.ico')
async def favicon():
    file_name = "favicon.ico"
    file_path = os.path.join(app.root_path, "static")
    return FileResponse(path=file_path, headers={"Content-Disposition": "attachment; filename=" + file_name})

@app.get('/abc')
def abc_test():
    return{'hello':'abc'}

So you'd be all set to run your first app using the FastAPI default ASGI server.

(env)$: uvicorn main:app --reload --host 0.0.0.0 --port ${PORT}