Docker HTTP-requests between containers
<p>I'm at the first stage in learning how to use Docker so I'm trying basic things. I've created two Node Express services that need to exchange data via HTTP-requests.</p>

<p><strong>My <code>docker-compose.yml</code> file</strong></p>

<pre><code>networks:
  isolation-network:
    driver: bridge

services:
  service1-nodejs:
    build:
    context: ./service1/
    dockerfile: .docker/node.dockerfile
    ports:
      - "10000:9000" 
      - "10001:5858" 
    env_file: ./service1/.docker/env/app.${APP_ENV}.env
    networks:
      - isolation-network

  service2-nodejs:
    build:
    context: ./service2/
    dockerfile: .docker/node.dockerfile
    ports:
      - "10010:9000" 
      - "10011:5858" 
    env_file: ./service2/.docker/env/app.${APP_ENV}.env
    networks:
      - isolation-network
</code></pre>

<p><code>service1</code> uses the <a href="https://github.com/request/request" rel="noreferrer">request module</a> to make a POST-request to <code>service 2</code>.</p>

<pre><code>request({ url: "http://service2:10010/api/",
                method: "POST",
                headers: { "Content-Type": "application/json" },
                json: true,
                body: { ... },
                time: true
            }, function (err, res, body) {
                if (!err &amp;&amp; res.statusCode == 200) {
                    // success
                }

                // failed
            });
</code></pre>

<p>The result of this call is:</p>

<blockquote>
  <p>{ Error: connect ECONNREFUSED 172.18.0.3:10010}</p>
</blockquote>

<p>Using postman I can test <code>service2</code> at <code>http://localhost:10010/api/</code> and I can confirm they actually can be reached and work as expected.</p>

<p>I'm missing something but can't figure it out. What is going wrong here?</p>