Communicating with server app running in container

Hi,
I’ve created very basic server app that listens for incoming connections on a port 8080.
If I send a request to that server the server correctly reacts to it by reading the sent message and replying to it.
Unfortunately when I put that application in the container I cannot communicate with it anymore. The application is running, I can see logs from it. I’ve tried to expose port in docker file, as well as publish port during docker run command. Nothing works.
Could anyone please help me with that issue?

Thank you

This is my Dockerfile:

FROM ubuntu

# Update default packages

RUN apt-get -qq update

# Get Ubuntu packages

RUN apt-get install -y -q \

build-essential \

curl

EXPOSE 8080

# NOTE: no need to run update again at this point

# RUN apt-get update

# Get Rust; NOTE: using sh for better compatibility with other base images

RUN curl https://sh.rustup.rs -sSf | sh -s -- -y

# Add .cargo/bin to PATH

ENV PATH="/root/.cargo/bin:${PATH}"

ADD src/ rust_app

ADD . rust_app

RUN cargo install --path rust_app

CMD [ "docker_custom_app" ]