How to set Access-Control-Max-Age for flask_cors?
Take a look at flask_cors.CORS section, the max_age part.
max_age (timedelta, integer, string or None) –
The maximum time for which this CORS request maybe cached. This value is set as the Access-Control-Max-Age header.
According to the docs, you may need to init your CORS with this parameter.
CORS(app, max_age=3600)