polka sapper api proxy example

polka-express-http-proxy.js

/*

they usually use ES Modules but i used CommonJS here
you can port it to suite your need

*/

const sirv = require("sirv");
const polka = require("polka");
const compression = require("compression");
const sapper = require("@sapper/server");
const proxy = require("express-http-proxy");
const { PORT, NODE_ENV } = process.env;
const dev = NODE_ENV === "development";
const apiProxy = proxy("http://127.0.0.1:8930");

// assign server variable
const server = polka();

// ⚠️ hack to make the proxy work with polka
// express-http-proxy is expecting these methods
server.use(function(req, res, next) {
  res.status = code => (res.statusCode = code);
  res.set = res.setHeader.bind(res);
  next();
});

// proxy to api
server.use("/api", apiProxy);

// do normal sapper server stuff
server
  .use(
    compression({ threshold: 0 }),
    sirv("static", { dev }),
    sapper.middleware()
  )
  .listen(PORT, err => {
    if (err) console.log("error", err);
  });