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Pyppeteer: How to set User-Agent

Setting the User-Agent header in Pyppeteer is as easy as

await page.setUserAgent("Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36
")

Remember to use this line before page.goto() to make sure the user agent is set before the first request is made.

Full example

#!/usr/bin/env python3
import asyncio
from pyppeteer import launch

async def main():
    browser = await launch()
    page = await browser.newPage()
    await page.setUserAgent("Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36")
    await page.goto('https://www.techoverflow.net', {'waitUntil': 'networkidle2'})
    # Make screenshot
    await page.screenshot({'path': 'screenshot.png'})
    # Cleanup
    await browser.close()

asyncio.get_event_loop().run_until_complete(main())