[Solved] Identify the error in this FastAPI request timing middleware code:import time from fastapi import FastAPI app = FastAPI() @app.middleware('http') def timing_middleware(request, call_next):... | FastAPI

FastAPI - Middleware and Hooks

Identify the error in this FastAPI request timing middleware code:

import time
from fastapi import FastAPI
app = FastAPI()

@app.middleware('http')
def timing_middleware(request, call_next):
    start = time.time()
    response = call_next(request)
    duration = time.time() - start
    response.headers['X-Time'] = str(duration)
    return response

AMissing async keyword and missing await before call_next(request)

BUsing time.time() instead of datetime.now()

CResponse headers cannot be modified in middleware

DMiddleware should be defined with @app.route decorator

Step-by-Step Solution

Solution:

Step 1: Check function signature and async usage
Middleware must be async and await call_next(request) because call_next is async.
Step 2: Identify missing await and async
Code lacks async def and await, causing runtime errors.
Final Answer:
Missing async keyword and missing await before call_next(request) -> Option A
Quick Check:
Async + await call_next required [OK]

Quick Trick: Middleware must be async and await call_next(request) [OK]

Common Mistakes:

MISTAKES

Forgetting async keyword on middleware function
Not awaiting call_next(request)
Using wrong decorator like @app.route

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More FastAPI Quizzes

Identify the error in this FastAPI request timing middleware code:

Step 1: Check function signature and async usage

Step 2: Identify missing await and async

Final Answer:

Quick Check:

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