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I am currently working with Docker and a simple Flask website to which I want to send images. For this I'm working on port 8080, but the mapping from docker to host is not working properly as I am unable to connect. Could someone explain to me what I am doing wrong?

docker-compose.yml

version: "2.3"
services:
 dev:
 container_name: xvision-dev
 build:
 context: ./
 dockerfile: docker/dev.dockerfile
 working_dir: /app
 volumes:
 - .:/app
 - /path/to/images:/app/images
 ports:
 - "127.0.0.1:8080:8080"
 - "8080"
 - "8080:8080"

dev.dockerfile

FROM tensorflow/tensorflow:latest

WORKDIR /app

COPY requirements.txt ./
RUN pip install -r requirements.txt

RUN apt update && apt install -y python-tk

EXPOSE 8080

CMD ["python", "-u", "app.py"]

app.py

@APP.route('/test', methods=['GET'])
def hello():
 return "Hello world!"
def main():
 """Start the script"""
 APP.json_encoder = Float32Encoder
 APP.run(host="127.0.0.1", port=os.getenv('PORT', 8080))

I start my docker with docker-compose up, this gives the output: Running on http://127.0.0.1:8080/ (Press CTRL+C to quit).

But when I do a get request to 127.0.0.1:8080/test I get that there is no response.

I have also tried docker-compose run --service-port dev as some people have suggested online but this says that there is no service dev.

Can someone help me for what I am doing wrong?

Use:

APP.run(host="0.0.0.0", port=os.getenv('PORT', 8080))

Using only:

ports:

 - "8080:8080"

is enough