Fix: Handle missing users gracefully in /user/<username> endpoint

[mw-middleware-labs-sandbox]

Problem

The user_profile function raises a KeyError when a non-existent user is requested, resulting in a 500 Internal Server Error instead of a proper 404 Not Found response.

Root Cause

Direct dictionary access user_data[username] at line 63 throws KeyError when the username doesn't exist in the dictionary.

Solution

• Replace direct dictionary access with .get() method for safe lookup
• Return 404 Not Found with descriptive error message when user is not found
• Maintain existing behavior for valid users

Impact

• Prevents unhandled KeyError exceptions
• Returns proper HTTP 404 status for missing users instead of 500
• Improves API semantics and user experience

Testing

• Valid user request: GET /user/user1 → 200 OK with profile data
• Missing user request: GET /user/user7 → 404 Not Found with error message

Fixes issue identified in APM trace: KeyError: "User 'user7' not found"

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Created By

Name: Sanjay
Email: sanjay+sandbox@middleware.io