javascript - Puppeteer 有时会抛出“UnhandledPromiseRejectionWarning: TimeoutError: Navigation Timeout Exceeded”
问题描述
我正在使用 Puppeteer 测试 Headless Chrome,所以我正在阅读文档并运行此代码*:
const puppeteer = require('puppeteer');
(async() => {
const browser = await puppeteer.launch();
const page = await browser.newPage();
await page.goto('https://www.github.com', {waitUntil: 'networkidle2'});
await page.screenshot({ path: 'screenshot.png' });
await browser.close();
})();
(*来自Docs-Usage 的片段)。
我更改了“example.com”,因为可以正常工作并尝试与其他站点一起使用,但是使用“github.com”脚本会在该行中返回超时异常await page.goto()
:
(node:7840) UnhandledPromiseRejectionWarning: TimeoutError: Navigation Timeout Exceeded: 30000ms exceeded
at Promise.then (C:\_test\headless\node_modules\puppeteer\lib\LifecycleWatcher.js:142:21)
at <anonymous>
-- ASYNC --
at Frame.<anonymous> (C:\_test\headless\node_modules\puppeteer\lib\helper.js:111:15)
at Page.goto (C:\_test\headless\node_modules\puppeteer\lib\Page.js:629:49)
at Page.<anonymous> (C:\_test\headless\node_modules\puppeteer\lib\helper.js:112:23)
at C:\_test\headless\index.js:7:16
at <anonymous>
at process._tickCallback (internal/process/next_tick.js:188:7)
(node:7840) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:7840) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
如果我使用常规浏览器访问 github.com,则可以正常连接,因此我的互联网连接不是问题。
我添加了下一行,两分钟后代码运行良好:
page.setDefaultNavigationTimeout(0);
但是如果我设置puppeteer.launch({headless:false})
代码在几秒钟内运行完美
我正在运行我的测试:
- Windows 7 专业版 SP1
- 节点 8.11.1
- 傀儡师 1.18.0
- Puppeteer 核心 1.18.0
解决方案
我遇到了同样的问题,但通过更换解决了
{waitUntil: 'networkidle2'}
和:
{waitUntil: 'domcontentloaded'}
更多信息在这里:
[ https://github.com/puppeteer/puppeteer/issues/2482][1]
只是为了添加更多信息,一些网站有很多内容,因此页面可能没有在默认的 30 秒超时内加载。所以取消这个,你可以通过这样做完全消除超时:
await page.setDefaultNavigationTimeout(0)
所以这看起来像这样:
const puppeteer = require('puppeteer');
(async () => {
const browser = await puppeteer.launch({ headless: false });
const page = await browser.newPage();
await page.setDefaultNavigationTimeout(0);
await page.goto('https://www.example.com/', {
waitUntil: 'networkidle2'
});
...