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In this post I will show you how to enable CORS (Cross Origin Resource sharing) so that you can make HTTP requests from a different domain than the one you use for your Flask application written in Python.
We will just add a kind of middleware to modify all the responses and add the headers that allow CORS in Flask.
Just add the following code, with the
@app.after_request annotation to indicate that we are modifying the response after the request:
The Access-Control-Allow-Origin indicates the domain from which the requests will be allowed. Credentials is useful in case you use sessions or cookies. Access-Control-Allow-Methods indicates which HTTP methods are valid for CORS.
Finally Access-Control-Allow-Headers indicates which headers will be accepted for CORS.
Remember that you are free to modify any value to adapt it to your needs.