docker-CodeIgniter file_get_contents无法打开流：连接被拒绝

Question

I'm new to the docker-code ignitor world. Issue is I cannot use file_get_contents inside the app as it keeps throwing the error:

file_get_contents(http://127.0.0.1:5000/index.php/lucky_api/get_population): failed to open stream: Connection refused

If I hard code the docker container IP address then it works. But I need to use the base_url so that I don't have to manually change the IP address every time I do docker-compose up.

My docker-compose.yml looks like this:

version: '2'

services:
  lucky:
    extends:
      file: common.yml
      service: lucky
    image: docker-lucky:local
    ports:
    - "5000:80"
    volumes:
    - ~/dev/LUCKY:/var/www/html
  oracle-db:
    extends:
      file: common.yml
      service: oracle-db
    image: oracle/database2:11.2.0.2-xe
    shm_size: '1gb'
    ports:
    - "1521:1521"
    environment:
    - ORACLE_PWD=12345
    volumes:
    - ~/dev/oracle-db/data:/u01/app/oracle/oradata
    - ~/dev/oracle-db/dumpFiles:/docker-entrypoint-initdb.d/startup