How to view the result of custom vsion model on a local machine flask server?

I have built a custom vision model that is used for classifying different types of leaves
Github Repo: https://github.com/timaddg/Customvision_local
in this repository, labels.txt has 39 different labels so I have given a path of test_image.JPG in the Dockerfile after building the image and running it using
"docker run -d -p 80:80 --name=ts4 testing4 python app.py "

when I open my localhost at port 80, I am supposed to get the predicted label of the test image, but the output I'm getting after http://localhost:80/ is

"CustomVision.ai model host harness"

So I wanted to know if my app.py has any bugs or any app.route has to be changed?

Thank you.