Crawling Pages Containing JavaScript: Dynamic Rendering Solution

Hands-on teaching you to deal with dynamic page crawling difficulties

Now many sites have played the "dynamic loading" trick, page data is like squeezing toothpaste like slowly loaded. We use ordinary crawlers to catch, often only get an empty shell page, the key data are hidden in the JavaScript. This is the time to move out of ourDynamic Rendering + Proxy IPCombo now.

Why are dynamic pages hard to work with?

There are three common scenarios:
1. Delayed loading of data as if on a slide (e.g., product reviews on e-commerce sites)
2. Hidden content that can only be viewed while logged in
3. The website comes with an "anti-climbing machine gun" that specializes in shooting at IPs that visit frequently.

at this momentProxy IP services from ipipgoIt can come in handy. For example, we have a customer before catching a ticket website, a single IP access less than 10 times to be pulled black. After switching to ipipgo's Dynamic Residential IP Pool, it didn't trigger the wind control for 3 days in a row.

Practical four-step solution

Step 1: Pick the right tool for the job
A crawler tool with a browser kernel is recommended, for example:
- Puppeteer (a must for Node.js parties)
- Selenium (preferred by old Python drivers)
- Playwright (Microsoft's new all-rounder)

 Python+Selenium Example
from selenium import webdriver

proxy = "http://用户名:密码@gateway.ipipgo.com:9020"
options = webdriver.ChromeOptions()
options.add_argument(f'--proxy-server={proxy}')
driver = webdriver.Chrome(options=options)

Step 2: Proxy Configuration to be Tailored
After getting the API link in the ipipgo backend, remember these parameters:
- Select HTTP(s) for protocol type
- Sessions are recommended to last 5-10 minutes.
- Geographical distribution is safer with a mixed model

Step 3: Counter-crawl strategies to see what's going on
- Randomized wait time (0.5-3 seconds is safer)
- Simulate mouse trajectory
- Empty browser fingerprints regularly

Common Rollover Scene QA

Q: Why do I still get blocked after using a proxy?
A: Check whether the data center IP, it is recommended to change to ipipgo's residential IP, the degree of camouflage is higher!

Q: What can I do if the page doesn't load fully?
A: Add a wait condition in the code, such as waiting for a specific element to appear before operating:

// Puppeteer example
await page.waitForSelector('.product-list', {timeout: 10000});

Q: What should I do if I am bombarded with CAPTCHAs?
A: ipipgo's Enterprise Edition package comes with a CAPTCHA cracking service, or set up to automatically reduce the frequency of requests

Avoiding the pitfalls guide to focus on

1. Don't operate on the same IP for more than 15 minutes.
2. 403 error first change the IP and try again
3. Higher success rate of crawling in the early morning hours
4. Newly registered ipipgo account remember to do IP quality test first

Recently helped a client deploy an automated capture system, using ipipgo's rotating IP pool + headless browser solution to crawl 100,000+ dynamic pages stably every day. The key is toKeeping IP freshIt is recommended to change the IP every 50 requests, this threshold can be customized in the ipipgo backend.

Finally, dynamic page crawling is a "cat and mouse game". Website update anti-climbing strategy, remember to adjust our IP use program. Any uncertainty, you can directly poke ipipgo's technical support, their family's after-sales response speed I give five stars.