Keep in mind that it is only a dummy example. The purpose of all posts in this profile is to help you to start. All improvements and applications in real world should be made by yourself, the reader.

To make it more secure you can use POST [1] or even Callable instead of HTTP Functions [2].

[1]: https://firebase.google.com/docs/functions/http-events
[2]: https://firebase.google.com/docs/functions/callable