A Flask app in production crashes with an error: RuntimeError: Working outside of application context. What is a likely cause?

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Flask - Deployment

A Flask app in production crashes with an error: RuntimeError: Working outside of application context. What is a likely cause?

ANot setting <code>FLASK_ENV=production</code>

BUsing debug mode in production

CRunning app with <code>app.run()</code> instead of Gunicorn

DTrying to access Flask features outside request or app context

Step-by-Step Solution

Solution:

Step 1: Understand application context in Flask
Flask requires an application context to access certain features like config or request.
Step 2: Identify cause of RuntimeError
Accessing these features outside a request or app context triggers this error.
Final Answer:
Trying to access Flask features outside request or app context -> Option D
Quick Check:
Application context error = A [OK]

Quick Trick: Use app/app_context() when accessing Flask features outside requests [OK]

Common Mistakes:

MISTAKES

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