[Solved] You added ProfilerMiddleware but see no profiling output. What is the most likely mistake in this code? from flask import Flask from werkzeug.... What is the most likely mistake in this code? | Flask

Flask - Performance Optimization

You added ProfilerMiddleware but see no profiling output. What is the most likely mistake in this code?

from flask import Flask
from werkzeug.middleware.profiler import ProfilerMiddleware
app = Flask(__name__)
app = ProfilerMiddleware(app, restrictions=[10])

@app.route('/')
def index():
    return 'Test'

AFlask app must be run with debug=True for profiling

BMissing import of ProfilerMiddleware

CRestrictions list must be empty

DProfilerMiddleware should wrap app.wsgi_app, not app directly

Step-by-Step Solution

Solution:

Step 1: Check how ProfilerMiddleware is applied
It incorrectly wraps app instead of app.wsgi_app.
Step 2: Correct usage for profiling
ProfilerMiddleware must wrap app.wsgi_app to work properly.
Final Answer:
ProfilerMiddleware should wrap app.wsgi_app, not app directly -> Option D
Quick Check:
Wrap app.wsgi_app, not app [OK]

Quick Trick: Always wrap app.wsgi_app with ProfilerMiddleware [OK]

Common Mistakes:

MISTAKES

Wrapping app instead of app.wsgi_app
Forgetting to import ProfilerMiddleware
Misconfiguring restrictions parameter

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You added ProfilerMiddleware but see no profiling output. What is the most likely mistake in this code?

Step 1: Check how ProfilerMiddleware is applied

Step 2: Correct usage for profiling

Final Answer:

Quick Check:

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