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Heroku-deployed Dash App - How to Force HTTPS Connection

I currently have a Dash app deployed on Heroku’s paid hobby plan ($7/mo) using a custom domain with automatic SSL enabled. The domain I purchased from Namecheap.

Right now when I type in the browser, my app shows up and it says the connection is secure.

However, if I just type in or, it says that the connection is not secure.

I want all users of my app to end up at either or regardless of what they type in their browser, so that they are not alarmed by the message that the connection is not secure.

How can I achieve this? I’m not technical so please explain it as plainly as possible.

Thanks very much.

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Any solution for this? I have exactly the same issue.