时间戳

首页 > 解决方案 > puppeteer 导航指标：每个请求/响应的开始和结束时间

javascript - puppeteer 导航指标：每个请求/响应的开始和结束时间

问题描述

我正在使用这个快速启动代码，允许在 puppeteer 无头的情况下进入页面。

const puppeteer = require('puppeteer');
(async () => {
    const args = [
        "--disable-setuid-sandbox",
        "--no-sandbox"
    ];
    const options = {
        args,
        headless: true,
        ignoreHTTPSErrors: true,
    };

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

    await page.goto("https://www.example.com/", {
        waitUntil: 'networkidle0',
        timeout: 30000
    });
    await page.close();
    await browser.close();
})()

我想了解有关导航的更多信息：

我能得到每个请求和每个响应的开始和结束时间吗？

puppeteer 中是否有允许获取这些指标的功能？

例如第一个请求的开始时间和第一个响应的结束时间？每个请求和每个响应的最终...

谢谢

标签： javascriptgoogle-chromepuppeteerchromiumheadless

解决方案

使用PerformanceObserver，您可以通过将条目类型指定为“资源”来获取每个请求的时间。将每个条目添加到对象window，然后使用 puppeteer 对其进行评估。

const puppeteer = require('puppeteer');

const perfObsRunner = () => {
  window.resourceList = [];
  new PerformanceObserver((list) => {
    list.getEntries().forEach((item) => {
      window.resourceList = [...window.resourceList, item.toJSON()]
    })
  }).observe({type: 'resource', buffered: true});
}


const getResourceTiming = async () => {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();

  await page.evaluateOnNewDocument(perfObsRunner);
  await page.goto("https://pptr.dev/", { waitUntil: 'load', timeout: 30000 });
  const resource = await page.evaluate(() => ({ resource: window.resourceList }))

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

从响应中您可以获取有关请求的信息，例如：startTime、duration、responseStart、responseEnd。 示例响应：

resource = [
    {
      "name": "https://pptr.dev/style.css",
      "entryType": "resource",
      "startTime": 55.9099999954924,
      "duration": 0,
      "initiatorType": "link",
      "nextHopProtocol": "h2",
      "workerStart": 0,
      "redirectStart": 0,
      "redirectEnd": 0,
      "fetchStart": 55.9099999954924,
      "domainLookupStart": 55.9099999954924,
      "domainLookupEnd": 55.9099999954924,
      "connectStart": 55.9099999954924,
      "connectEnd": 55.9099999954924,
      "secureConnectionStart": 55.9099999954924,
      "requestStart": 0,
      "responseStart": 0,
      "responseEnd": 55.9099999954924,
      "transferSize": 0,
      "encodedBodySize": 3704,
      "decodedBodySize": 14326,
      "serverTiming": [],
      "workerTiming": []
    },
    {
      "name": "https://pptr.dev/index.js",
      "entryType": "resource",
      "startTime": 56.08000000938773,
      "duration": 0,
      "initiatorType": "script",
      "nextHopProtocol": "h2",
      "workerStart": 0,
      "redirectStart": 0,
      "redirectEnd": 0,
      "fetchStart": 56.08000000938773,
      "domainLookupStart": 56.08000000938773,
      "domainLookupEnd": 56.08000000938773,
      "connectStart": 56.08000000938773,
      "connectEnd": 56.08000000938773,
      "secureConnectionStart": 56.08000000938773,
      "requestStart": 0,
      "responseStart": 0,
      "responseEnd": 56.08000000938773,
      "transferSize": 0,
      "encodedBodySize": 52861,
      "decodedBodySize": 149772,
      "serverTiming": [],
      "workerTiming": []
    },
    {
      "name": "https://raw.githubusercontent.com/GoogleChrome/puppeteer/main/README.md",
      "entryType": "resource",
      "startTime": 98.98000000976026,
      "duration": 1.6949999844655395,
      "initiatorType": "fetch",
      "nextHopProtocol": "h2",
      "workerStart": 0,
      "redirectStart": 0,
      "redirectEnd": 0,
      "fetchStart": 98.98000000976026,
      "domainLookupStart": 0,
      "domainLookupEnd": 0,
      "connectStart": 0,
      "connectEnd": 0,
      "secureConnectionStart": 0,
      "requestStart": 0,
      "responseStart": 0,
      "responseEnd": 100.6749999942258,
      "transferSize": 0,
      "encodedBodySize": 0,
      "decodedBodySize": 0,
      "serverTiming": [],
      "workerTiming": []
    },
]

推荐阅读