Flask maps HTTP requests to Python code
Flask is a lightweight web framework. A route connects an HTTP method and URL pattern to a Python function that creates a response.
Keep route handlers focused
A small example can keep everything in one file, but production applications benefit from separating request validation, business rules and database access from the HTTP layer.
Understand the request lifecycle
A client sends a request, Flask matches the route, the view function runs, and Flask creates the HTTP response. Authentication, authorization, validation and error handling should happen at clear boundaries.
Practice: create a JSON endpoint for a product and return an appropriate response when the requested product ID is invalid or missing.
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