python flask enable cors

Published: 04 February 2024
on channel: CodeQuest

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Enabling Cross-Origin Resource Sharing (CORS) in a Python Flask application is essential when your web application's frontend and backend are hosted on different domains. CORS is a security feature implemented by web browsers to restrict web pages from making requests to a different domain than the one that served the web page. In this tutorial, we'll walk through the process of enabling CORS in a Flask application using the Flask-CORS extension.
To get started, you need to install the Flask-CORS extension. You can do this using pip:
In your Flask application, you need to import the CORS class from the flask_cors module and configure it to allow requests from specific origins. Create a new Python file (e.g., app.py) and include the following code:
In this example, we import the CORS class and apply it to our Flask app using CORS(app). This enables CORS for all routes.
By default, Flask-CORS allows all origins (*). However, you may want to specify which origins are allowed. To do this, you can pass a list of allowed origins to the origins parameter of the CORS class. Modify the CORS(app) line as follows:
Replace the example origins with the actual origins of your frontend application.
Save your changes and run your Flask application:
Your Flask application is now running on http://localhost:5000 by default.
Now, you can make requests from your frontend to your Flask backend, and CORS should be enabled. If you're using JavaScript and making requests with the Fetch API or Axios, you should no longer encounter CORS-related issues.
That's it! You've successfully enabled CORS in your Flask application using the Flask-CORS extension. Make sure to adjust the CORS configuration based on your specific requirements and security considerations.
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