[Solved] Consider this FastAPI code snippet:from fastapi import FastAPI app = FastAPI() @app.on_event("startup") async def startup_event(): print("Starting app") @app.... | FastAPI

FastAPI - Middleware and Hooks

Consider this FastAPI code snippet:

from fastapi import FastAPI
app = FastAPI()

@app.on_event("startup")
async def startup_event():
    print("Starting app")

@app.on_event("shutdown")
async def shutdown_event():
    print("Stopping app")

@app.get("/")
async def read_root():
    return {"message": "Hello"}

What will be printed when the server starts and then stops?

AStopping app (on start), Starting app (on shutdown)

BStarting app (on start), Stopping app (on shutdown)

COnly Starting app when server starts

DNo output printed at all

Step-by-Step Solution

Solution:

Step 1: Identify startup and shutdown prints
The startup_event prints "Starting app" when the app starts, and shutdown_event prints "Stopping app" when the app stops.
Step 2: Understand event timing
These events run once each: startup at launch, shutdown at server stop.
Final Answer:
Starting app (on start), Stopping app (on shutdown) -> Option B
Quick Check:
Startup prints "Starting app", shutdown prints "Stopping app" [OK]

Quick Trick: Startup prints on launch, shutdown prints on stop [OK]

Common Mistakes:

MISTAKES

Swapping startup and shutdown outputs
Expecting prints on every request
Thinking no output occurs without explicit call

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More FastAPI Quizzes

Consider this FastAPI code snippet:

Step 1: Identify startup and shutdown prints

Step 2: Understand event timing

Final Answer:

Quick Check:

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