Getting access to FastAPI (uvicorn) running in a docker container with Elastic Beanstalk

I've been trying the whole day to properly set up my application, but alas without success. I've built a FastAPI app that is currently running without problems on DigitalOcean and getting deployed from gitlab. After trying to set everything up for a move to AWS, I'm stuck. I managed to have gitlab build and deploy a container to ECR and get that container up and running in Elastic Beanstalk. I can see in the docker logs that the app properly loads. The problem is that nginx just returns a 502 bad gateway error and I can't seem to figure out how to configure it.

I've now updated my custom_proxy file to make it work and I'm seeing if I'm able to get EBS to use it instead of the default one. Here's the file:

events {}

http {
  upstream uvicorn {
    server 172.17.0.2:5000;
  }

  server {
    listen 80;

    location / {
      proxy_pass http://uvicorn;
      proxy_set_header Host $host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto $scheme;
    }
  }
}

Using the internal IP of the docker container was part of the breakthrough.