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a bit more than 5 lines actually

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

app.get('/', (req, res) => {
  console.log("fetching ...", req.query.url);
  if (req.query.url) fetch(req.query.url, (data) => {res.send(data); });
  else res.send("missing url");
});

const port = 9999;

app.listen(port, () => {
  console.log(`fetch a url with http://localhost:${port}?url=https://somewhere.com/this-that`);
});

function fetch(url, cb) {
  require("https").get(url, res => {
    res.setEncoding("utf8");
    let body = "";
    res.on("data", data => { body += data; });
    res.on("end", () => { cb(body); });
  });
}

thanks @MaBe, but I already wrote a simple node 5 liner that fits my needs ;)

this thread is old, but just thought it's worth while stressing what @Gordon mentioned above:
you can't perform a REST API call on a 'cheap' ESP8266 board, you'll need one of the boards that supports this.
I actually like the idea of developing with the more expensive Wifi board, but I'd like to deliver them cheap boards of 2$ ESP8266 - and that (apparently) can't be used - unless you write and hosts an http to https proxy somewhere - not that hard really :) and you can still stay free with platforms like heroku

------- edit ----------
btw - these boards DO support Firebase if you went along the C++ standard Arduino IDE, just far less fun coding on those

just another programmer in the multi-verse of multi language multi platform