Fastapi returns 404 when accessing URL in the browser

Question

I am learning fastapi and created the sample following application

from fastapi import FastAPI
import uvicorn
app = FastAPI()

@app.get("/hello")
async def hello_world():
   return {"message": "hello_world"}

if __name__== "__main__":
   uvicorn.run(app, host="127.0.0.1", port=8080)

The server starts fine but when I test the url in browser I am getting the following error:

{"detail": "Not Found"}

and this error in the log:

"GET / HTTP /" 404 Not Found

I noticed another weird problem, when I make some error its not detecting the error and still starting the server. For example if I change the function like the following

@app.get("/hello")
async def hello_world():
   print (sample)
   return {"message": "hello_world"}

It should have thrown the error NameError: "sample" not defined but it still is starting the server. Any suggestions will be helpful

Answer 1

Question 1: Of course it doesn't work. You code a handler for path /hello. But you are testing path / which is not configured.

Question 2: You didn't define the variable sample.

Answer 2

always add the trailing slash after the path, had the same issue, took me hours to debug