Closing a page while an active CDP session exists causes a crash. How can I properly detach the session?
const puppeteer = require('puppeteer');
(async () => {
const browserInstance = await puppeteer.launch();
const tab = await browserInstance.newPage();
const cdpClient = await tab.target().createCDPSession();
await cdpClient.send('Input.executeScroll', { posX: 120, posY: 240, delta: -160 });
await tab.close();
})();
hey, i ended up calling await cdpClient.detach() before doing page.close(). it fixed my crashes by properly ending the session.
In my experience, ensuring that all CDP operations have sufficiently completed before closing the page is crucial. I encountered similar crashes, and my solution was to allow a brief delay after executing any CDP command. Instead of immediately closing the tab, I use a small timeout to give the session time to fully process any pending operations. This is especially necessary on environments where asynchronous tasks might linger. Using this approach provides an additional layer of safety without impacting overall performance.
I have encountered similar issues when developing web scraping solutions with Puppeteer. The approach that worked best for me was to ensure that the CDP session was always properly detached, even in the face of potential errors. To achieve this, I wrapped the session interactions within a try-finally block. This guarantees that cdpClient.detach() is called regardless of the command outcome before I proceed to close the page. Using this pattern not only prevents crashes but also avoids resource leaks, making my code more robust under various failure modes.
hey, i add a tiny delay after calling cdpClient.detatch() before page.close(). sometimes the session needs a moment to wrap up, so waiting helps avoid those crashes. hope this helps!
In my experience, a more deterministic approach has been to listen for the CDP session’s ‘detached’ event and only close the page after the event confirms that the session has ended. This method eliminates the uncertainty that comes with relying on timeouts or immediate detach calls. I implemented this in one of my projects by wrapping the detach call in a promise that resolved upon the event. This technique ensures that all resources tied to the CDP session have been properly released, reducing the risk of unexpected crashes.