Some basic experimentation with Puppeteer - Prints response-body and gets screenshot.

puppeteer-experiment.js

const puppeteer = require('puppeteer');

const url = process.argv[2];
if (!url) {
    throw "Please provide URL as a first argument";
}

async function run () {
    const browser = await puppeteer.launch( {
        headless: true
    }); 

    const page = await browser.newPage(); 
    await page.goto(url);
    
    await page.on('response', async (response) => {    
        console.log('XHR response received'); 
        console.log(await response.text()); 
    }); 
    await page.content(); 


    const body = await page.evaluate(() =>  {
        return document.querySelector("body").innerText; 
    }); 

    console.log(body);
    await page.screenshot({path: 'screenshot.png'});
    // browser.close();
}

run();