What are CORS and how do you configure them in a Python backend?
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CORS (Cross-Origin Resource Sharing) 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. This helps prevent malicious sites from accessing sensitive data on another domain via a user's browser.
By default, browsers block cross-origin HTTP requests (e.g., JavaScript from example.com trying to access an API on api.example.org). CORS allows a server to explicitly declare which origins are permitted to access its resources.
Configuring CORS in a Python Backend
If you're using Flask, a common way to handle CORS is with the flask-cors extension:
In FastAPI (based on Starlette), CORS is configured using middleware:
Always restrict CORS settings to trusted origins in production to minimize security risks.
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