HTML Parser: Web page HTML data extraction tool

What the heck is an HTML parser?

Engaged in data collection of the old iron know, web page data capture is like playing hide and seek. You just grabbed a few data, the site will block your IP, this timeHTML parserIt becomes your unlocking tool. Simply put, this thing is a program that specializes in accurately gleaning data from the HTML code of web pages, such as product prices, news headlines, and other key information.

But a parser isn't enough, it's like when you open a lock with a master key and you end up being targeted by a security guard (a website's anti-climbing mechanism). That's when you needproxy IPTo cover, ipipgo's dynamic IP pool allows you to change your face every time you visit, making the target site think it's operated by a different user.

Hands on to build an anti-blocking crawler

Let's take a chestnut with Python requests and BeautifulSoup. Focus on how to use ipipgo's proxy service to avoid being blocked:

import requests
from bs4 import BeautifulSoup

 Here we replace it with the real proxies provided by ipipgo
proxies = {
  'http': 'http://username:password@gateway.ipipgo.com:9020',
  'https': 'http://username:password@gateway.ipipgo.com:9020'
}

try.
    response = requests.get('destination URL', proxies=proxies, timeout=10)
    soup = BeautifulSoup(response.text, 'html.parser')
     Let's say we want to catch the price of a product
    price_tag = soup.select_one('.product-price')
    print(f "Current price: {price_tag.text}")
except Exception as e.
    print(f "Catch error: {str(e)}")

take note ofThe username and password in the proxy address.To change to the real credentials obtained by the ipipgo backend. It is recommended to write the proxy configuration as a separate configuration file for easy reuse in different projects.

Proxy IP Selection Guide to Avoid Pitfalls

The market is a mixed bag of agency services, so remember these three hard indicators:

Special reminder: don't use free proxy for cheap, those IPs have long been in the blacklist of the major sites. ipipgoCommercial-level agent poolMillions of IPs are updated daily, specializing in e-commerce, social media and other anti-crawling strict platforms.

Practical Frequently Asked Questions QA

Q: What should I do if I use a proxy IP and still get blocked?
A: Check whether the request frequency is too high, it is recommended to add random delay (0.5-3 seconds) in the code. ipipgo background can be set to automatically switch IP trigger conditions, such as 3 consecutive failures to automatically change IP.

Q：What should I do if the data is garbled when I grab it back?
A: Add headers parameter in requests.get() to simulate browser access. Remember to update User-Agent regularly, there is a ready-made UA generator in ipipgo's supporting toolkit.

Q: What if I need to work on a large number of tasks at the same time?
A: on multithreading + proxy IP pool combo. ipipgo supportConcurrency customization, adjusting the number of IPs used simultaneously according to business needs to avoid single-IP overload.

Upgrade Play: Intelligent Parsing System

For target websites that are frequently revamped, intelligent parsing can be engaged with machine learning. When the original CSS selector is found to be invalid, the alternate parsing scheme is automatically enabled. This is when ipipgo'sLong-term agency packagesIt comes in handy to be able to maintain a stable connection to complete model training.

To cite a real case: a customer with this program to capture real estate data, with ipipgo's residential agent service, successfully bypassed a large platform geographic location verification, data collection efficiency increased by 6 times. But pay attention to comply with the website robots agreement, don't make people's servers crash.

Finally, a nagging word: proxy IP is not a panacea, and request header camouflage, CAPTCHA recognition of these techniques with the use. It is recommended to use ipipgo'sFree Trial PackageTest the effect, and then decide what specifications on the service. Engage in data collection is like fighting guerrilla warfare, pay attention to fast, accurate and stable, don't stick to an IP in the end.