awesome-compose/react-express-mysql/backend/healthcheck.js

const http = require("http");

const options = {
  timeout: 2000,
  host: "localhost",
  port: process.env.PORT || 8080,
  path: "/healthz" // must be the same as HEALTHCHECK in Dockerfile
};

const request = http.request(options, res => {
  console.info("STATUS: " + res.statusCode);
  process.exitCode = res.statusCode === 200 ? 0 : 1;
  process.exit();
});

request.on("error", function(err) {
  console.error("ERROR", err);
  process.exit(1);
});

request.end();