Query GCP metadata server

curl.sh

$ curl -H "Metadata-Flavor:Google" http://metadata.google.internal/computeMetadata/v1/project/project-id

index.js

// https://cloud.google.com/compute/docs/storing-retrieving-metadata

const express = require('express');
const axios = require('axios');
const app = express();

const axiosInstance = axios.create({
  baseURL: 'http://metadata.google.internal/',
  timeout: 1000,
  headers: {'Metadata-Flavor': 'Google'}
});

app.get('/', (req, res) => {
  let path = req.query.path || 'computeMetadata/v1/project/project-id';
  axiosInstance.get(path).then(response => {
    console.log(response.status)
    console.log(response.data);
    res.send("" + response.data);
  });
});

const port = process.env.PORT || 8080;
app.listen(port, () => {
  console.log('Hello world listening on port', port);
});

package.json

{
  "name": "metadata",
  "version": "1.0.0",
  "description": "Metadata server",
  "main": "app.js",
  "scripts": {
    "start": "node index.js"
  },
  "author": "",
  "license": "Apache-2.0",
  "dependencies": {
    "axios": "^0.18.0",
    "express": "^4.16.4"
  }
}