[Solved] Which of the following is the correct way to define a before_request handler in Flask? — Ans: Use @app.before_request without parentheses above the function | Flask

Flask - Middleware and Extensions

Which of the following is the correct way to define a before_request handler in Flask?

AUse <code>@app.before_request()</code> with parentheses above the function

BUse <code>@app.before_request</code> without parentheses above the function

CCall <code>app.before_request(function_name)</code> after defining the function

DDefine the function inside <code>app.before_request()</code> block

Step-by-Step Solution

Solution:

Step 1: Recall Flask decorator syntax
The @app.before_request decorator is used without parentheses.
Step 2: Analyze options
Use @app.before_request() with parentheses above the function incorrectly adds parentheses, which is invalid. Call app.before_request(function_name) after defining the function is not how Flask registers before_request handlers. Define the function inside app.before_request() block is not valid syntax.
Final Answer:
Use @app.before_request without parentheses above the function -> Option B
Quick Check:
Decorator syntax in Flask does not use parentheses here. [OK]

Quick Trick: Decorator syntax for before_request has no parentheses [OK]

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Which of the following is the correct way to define a before_request handler in Flask?