Explain the request-response cycle in Flask.

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In Flask, the request-response cycle refers to the process by which a web application receives a request from a client (usually a browser), processes it, and sends back a response. Here's how it works:

1. Client Sends a Request

• The cycle starts when a client (like a web browser) makes an HTTP request (e.g., GET, POST) to the Flask server by accessing a URL.

2. Flask Receives the Request

• Flask captures the request and creates a Request object (flask.request) that contains all the data: method, headers, form data, JSON, etc.

3. Routing

• Flask uses the URL routing system to match the request path to a view function (a Python function defined with @app.route()).

• If no route matches, Flask returns a 404 error.

4. View Function Executes

• The matched view function is executed. It can:

  • Process data

  • Interact with databases

  • Call other services

  • Generate HTML or JSON

5. Response is Created

• The view function returns a Response object, which may include:

  • HTML content

  • JSON data

  • Redirects

  • Status codes and headers

6. Flask Sends the Response

• Flask sends the response back to the client over HTTP.

• The browser receives it and renders the content (e.g., an HTML page or a JSON result).

Summary

Flask’s request-response cycle:
Client Request → Flask Routing → View Function → Response → Back to Client

This cycle is the core of how Flask applications serve web content dynamically.

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