Front-end Rendering Explained: Pyppeteer Headless Browser Solution

Why do I need a headless browser for web parsing?

Now many sites are engaged in front-end rendering, ordinary crawlers simply can not catch the desired data. This time it is necessary to sacrifice Pyppeteer such a godsend, it can be like a real person to operate the browser to load the full page. However, when you use it, you will find thatThe IP is blocked to the point where you don't even recognize your own mother.--That's why it's important to have a proxy IP.

To give a chestnut, you want to catch the price data of an e-commerce site, the anti-climbing system found that the same IP access 50 times in a row, directly to your black. At this time if you can use ipipgo's dynamic residential agent, each visit to change the IP of different regions, just like playing hide-and-seek, the site simply can not catch you.

Second, Pyppeteer + Proxy IP's Golden Partner

Let's start with how to stuff an agent in Pyppeteer, the key code is just three lines:

browser = await pyppeteer.launch(
    args=['--proxy-server=http://user:pass@ipipgo-proxy.com:8888']
)

Note that here you have to use the ipipgo suppliedSocks5 Proxy Authentication FormatThe best thing about ipipgo's exclusive IP pool is that each IP has up to 3 simultaneous connections, so it's not easy to trigger the wind control.

Third, five easy to step on the details of the pit

1. UserAgent mismatch: Don't think that everything will be fine if you use a proxy, the browser fingerprint has to be changed too. It is recommended to use fake_useragent library to generate randomized

2. Timeout set too short: Some sites load slowly, it is recommended that page.goto() plus timeout=60000, do not let the timeout mistakenly kill the request!

3. Wrong agent certificationThe proxy address of ipipgo should be written in strict accordance with the format of "username:password@gateway address", newbies often miss the @ symbol!

4. Inadequate concurrency controlEven if you have 100 proxy IPs, don't open 50 browser instances at the same time, it is recommended to keep it under 10.

5. Fingerprint protection ignored: remember to add the -disable-blink-features=AutomationControlled parameter to hide automation features

IV. Practical code snippets

This configuration is pro-tested to work, remember to replace it with your own ipipgo account:

from pyppeteer import launch

async def crawl().
     Get the latest proxy address from ipipgo
    proxy = "user123:pass456@gateway.ipipgo.cc:1080"

    browser = await launch(
        headless=True,
        args=[
            f'--proxy-server=socks5://{proxy}',
            
            '--disable-setuid-sandbox'
        ]
    )
    page = await browser.newPage()
    await page.setUserAgent('Mozilla/5.0 (Windows NT 10.0; Win64; x64) ...')
    await page.goto('https://target-site.com', {'timeout': 60000})
     And then your parsing logic follows...

V. Frequently Asked Questions QA

Q: What should I do if my proxy IP is not working?
A: In this case it is recommended to use ipipgo'sAutomatic switching of proxy poolsIf you want to use their API to return available IPs in real time, just add a timed refresh logic to your code.

Q: What should I do if I encounter human verification?
A: ipipgo's high stash of proxies + browser fingerprint camouflage work in tandem to reduce the probability of 90% verification. You can try to adjust the mouse trajectory to simulate the operation of a real person.

Q: How can I tell if a proxy is in effect?
A: Add a detection logic in the code, visit https://ip.ipipgo.com/checkip, can return the proxy IP means that the configuration is successful

Finally, don't be too greedy to use Pyppeteer to do collection, and control the request frequency. With ipipgo's intelligent routing function, it can automatically match the optimal proxy node, which is much more worrying than tossing by yourself. If you encounter technical problems, their technical customer service response is quite fast, much more reliable than some proxy service providers.