After starting Gunicorn with gunicorn -w 2 -b 0.0.0.0:8000 app:app, you notice no requests are served. What is a likely cause?

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Flask - Performance Optimization

After starting Gunicorn with gunicorn -w 2 -b 0.0.0.0:8000 app:app, you notice no requests are served. What is a likely cause?

AGunicorn does not support binding to 0.0.0.0

BFirewall or network settings block port 8000

CThe app variable is not callable

DGunicorn requires the Flask app to be run with debug=True

Step-by-Step Solution

Solution:

Step 1: Understand binding to 0.0.0.0
Binding to 0.0.0.0 means Gunicorn listens on all interfaces, which is valid.
Step 2: Consider network issues
If no requests reach the app, firewall or network blocking port 8000 is a common cause.
Final Answer:
Firewall or network settings block port 8000 -> Option B
Quick Check:
Network blocking port = no requests served [OK]

Quick Trick: Check firewall if Gunicorn listens but no requests arrive [OK]

Common Mistakes:

MISTAKES

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