This code will work when you are using catalyst serve command and may not work when deployed.
Reason: In the tutorial we were using python virtual environment to create the application, but the same may not work when deployed to resolve this issue, deactivate your virtual environment using deactivate command and install the packages with -t falg.
Example:
pip install flask -t .
Typically, Python frameworks are unable to manage all incoming requests in a production environment. To effectively handle these requests, it is necessary to employ tools such as gunicorn. If you are utilizing gunicorn, please consult the documentation at https://docs.gunicorn.org/en/stable/ for configuring it in your application. Additionally, remember to modify the command in app-config.json to accommodate the changes.
app-config.json after changes
{
"command": "python3 -u -m gunicorn main:app --bind 0.0.0.0:$X_ZOHO_CATALYST_LISTEN_PORT",
"buildPath": "/myLocation/AppSail/AppSailPython",
"stack": "python_3_9",
"env_variables": {},
"memory": 256
}