index.js

const http = require('http');

// velixir injects PORT. Bind it, and bind 0.0.0.0 rather than localhost, or the
// platform health check cannot reach the container and the deploy never goes live.
const port = process.env.PORT || 8080;

const page = `<!doctype html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>Live on velixir</title>
<style>
  :root { color-scheme: dark; }
  body { margin:0; min-height:100vh; display:grid; place-items:center;
         background:#0b0b10; color:#e8e8ef;
         font:16px/1.6 ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif; }
  main { max-width:34rem; padding:2.5rem 1.5rem; text-align:center; }
  h1 { font-size:1.6rem; margin:0 0 .5rem; letter-spacing:-.02em; }
  p { color:#a0a0b0; margin:.5rem 0; }
  code { background:#16161f; border:1px solid #26263a; border-radius:6px;
         padding:.15rem .4rem; font-size:.875em; color:#c7d2fe; }
  .dot { display:inline-block; width:.5rem; height:.5rem; border-radius:50%;
         background:#34d399; margin-right:.5rem; vertical-align:middle; }
</style>
<main>
  <p><span class="dot"></span>Node.js is running on velixir</p>
  <h1>Your first deploy worked.</h1>
  <p>This page is served by your own container, built from source. No Dockerfile was involved.</p>
  <p>Next: edit <code>index.js</code>, then run <code>velixir deploy</code>.</p>
</main>`;

http.createServer((req, res) => {
  if (req.url === '/healthz') {
    res.writeHead(200, { 'Content-Type': 'text/plain' });
    return res.end('ok');
  }
  res.writeHead(200, { 'Content-Type': 'text/html; charset=utf-8' });
  res.end(page);
}).listen(port, '0.0.0.0', () => {
  console.log(`listening on ${port}`);
});