木偶-协议错误（Page.navigate）：目标已关闭

如您在下面的示例代码中所看到的，我将Puppeteer与Node中的一组工作人员一起使用，以通过给定的URL运行多个网站截图请求：

const cluster = require('cluster');
const express = require('express');
const bodyParser = require('body-parser');
const puppeteer = require('puppeteer');

async function getScreenshot(domain) {
    let screenshot;
    const browser = await puppeteer.launch({ args: ['--no-sandbox', '--disable-setuid-sandbox', '--disable-dev-shm-usage'] });
    const page = await browser.newPage();

    try {
        await page.goto('http://' + domain + '/', { timeout: 60000, waitUntil: 'networkidle2' });
    } catch (error) {
        try {
            await page.goto('http://' + domain + '/', { timeout: 120000, waitUntil: 'networkidle2' });
            screenshot = await page.screenshot({ type: 'png', encoding: 'base64' });
        } catch (error) {
            console.error('Connecting to: ' + domain + ' failed due to: ' + error);
        }

    await page.close();
    await browser.close();

    return screenshot;
}

if (cluster.isMaster) {
    const numOfWorkers = require('os').cpus().length;
    for (let worker = 0; worker  {
        const domain = req.body.domain;

        getScreenshot(domain)
            .then((screenshot) =>
                try {
                    process.send({ domain: domain });
                } catch (error) {
                    console.error('Error while exiting worker ' + process.pid + ' due to: ' + error);
                }

                res.status(200).json({ screenshot: screenshot });
            })
            .catch((error) => {
                try {
                    process.send({ domain: domain });
                } catch (error) {
                    console.error('Error while exiting worker ' + process.pid + ' due to: ' + error);
                }

                res.status(500).json({ error: error });
            });
    });
}

Error: Protocol error (Page.navigate): Target closed.

Error: Protocol error (Runtime.callFunctionOn): Session closed. Most likely the page has been closed.

const browser = await puppeteer.launch();
const page = await browser.newPage();

await browser.close();
await page.goto('http://www.google.com');