dirty-async-fetch.js

"use strict";

/*
User-defined settings
*/
const protocol = "https"; // Change to http for old-school

/*
Begin!
*/
const agentGet = require(protocol).get;

/**
 *
 * @param {URL|string|Object} url      .
 * @param {?string}           encoding Set it explicitly to `null` to keep a buffer
 * @return {Promise<string | Buffer>}
 */
function getFullBody (url, encoding = "utf8") {
  return new Promise((resolve, reject) => {

    agentGet(url, async (res) => {
      const data = [];

      if (encoding)
        res.setEncoding(encoding);

      res.on("error", reject);

      for await (const chunk of res)
        data.push(chunk);

      if (encoding)
        resolve(data.join(""));

      else
        resolve(Buffer.concat(data));

    }).on("error", reject);

  });
}

/*
Example
*/
(async function main () {
  const res = await getFullBody("https://jsonplaceholder.typicode.com/posts/1");

  console.log(res);
})().catch(console.error);