木偶有时会抛出“ UnhandledPromiseRejectionWarning:TimeoutError:导航超时超过”

时间:2019-06-25 15:50:25

标签: javascript node.js puppeteer

我正在使用Puppeteer测试无头Chrome,因此我reading docs并运行以下代码*:

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();
})();

(* Docs-Usage的摘录)。

我更改了“ example.com”,因为它可以正常工作并可以在其他站点上尝试,但是使用“ github.com”脚本会在await page.goto()行中返回超时异常:

(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,则可以按正常时间进行连接,因此我的互联网连接不是问题。

我已经添加了下一行,并且代码在两分钟后运行良好:

page.setDefaultNavigationTimeout(0);

但是,如果我设置puppeteer.launch({headless:false}),那么代码将在几秒钟内完美运行

我正在根据以下条件进行测试:

  • Windows 7专业版SP1
  • 节点8.11.1
  • 木偶1.18.0
  • Puppeteer Core 1.18.0

2 个答案:

答案 0 :(得分:3)

我遇到了同样的问题,但是通过替换来解决了

{waitUntil: 'networkidle2'}

具有:

  {waitUntil: 'domcontentloaded'}

更多信息在这里:

[https://github.com/puppeteer/puppeteer/issues/2482][1]

仅添加更多信息,某些网站上就有很多内容,因此该页面可能未在30秒的默认超时内加载。因此,取消此操作,您可以完全删除超时:

 await page.setDefaultNavigationTimeout(0)

所以它看起来像这样:

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'
});
  ...

答案 1 :(得分:0)

有时服务器不响应无头请求(puppeteer #2963)。
为了验证这一点,我将尝试在调试模式下运行代码:

DEBUG=*session node your-test-file.js