Python Flask I have a flask middleware in which I want to calculate the time taken by the requests a

Sure, I'd be happy to help you create a tutorial for adding a middleware in Flask to calculate the time taken by requests and then adding it to the response header. Below is a step-by-step guide with code examples:
Make sure you have Python and Flask installed on your machine. If not, you can install Flask using the following command:
Initialize the Flask app:
Define a middleware function that calculates the time taken by the request and stores it in the g object. Add this function before any route in your application:
This function uses the before_request decorator, which is called before a request is processed. It records the start time of the request in the g object.
Define a function that calculates the duration of the request after it has been processed and adds the duration to the response header:
This function takes the response object, calculates the duration by subtracting the start time from the current time, and adds the duration to the 'X-Request-Duration' header.
Register the add_duration_to_header function to be called after each request:
The after_request decorator ensures that the add_duration_to_header function is called after processing each request.
Finally, create a sample route to test the middleware:
Run your Flask application:
Congratulations! You've successfully created a Flask middleware to calculate the time taken by requests and added it to the response header. This can be useful for debugging and performance monitoring.
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