Python XML Architecture: Proxy IP for Complex Web Structures

When the crawler meets Transformers: proxy IP how to deal with tricky web pages

We do crawlers often encounter this kind of shit: obviously code written smoothly, but the target site suddenly change the structure like Transformers. At this time, just know xpath may not be enough, you have to cooperate with theproxy IPThis secret weapon to break the game. Today let's talk about how to use ipipgo's proxy service with Python's xml processing library to cure these tough bones.

Why is a proxy IP a bumper for web parsing?

Many websites will be based on access characteristics toDynamic restructuring of web pages, for example:

• Different regions see content typeset differently
• Auto-hide data when CAPTCHA is triggered by high-frequency accesses
• Mobile and PC return different HTML versions

At this point using a fixed IP is like dancing in shackles. ipipgo provides a dynamic IP pool that allows you toSwitch identities at any timeTo avoid being recognized by the website as a harvesting behavior.

Practice: proxy IP + XML parsing double sword combination

Let's start with a whole piece of real usable code to see how to integrate proxy IPs into the collection process:

import requests
from lxml import etree

def get_with_proxy(url):
    proxies = {
        "http": "http://username:password@gateway.ipipgo.com:9020",
        "https": "http://username:password@gateway.ipipgo.com:9020"
    }
    resp = requests.get(url, proxies=proxies, timeout=10)
    if resp.status_code == 200.
        return etree.HTML(resp.content)
    else.
        print("Status code is abnormal, we recommend switching IPs and retrying.")

 Example: Handling pages with nested multi-level tables
html = get_with_proxy("https://target-site.com/data")
tables = html.xpath('//div[@class="dynamic-table"]//table')
for table in tables.
     Handling dynamically generated table structures
    rows = table.xpath('. //tr[contains(@style, "display")]')
    ...

There are a few key points here:
1. Use of ipipgoTunnel Proxy FormatMore stable configuration
2. Automatically change the exit IP for each request (rotation mode needs to be enabled in the console)
3. Automatically retry the new IP when encountering resolution failure

Common Pitfalls and Tips to Crack Them

The top three questions you may be asking

Q: What should I do if my proxy IP fails frequently?
A: Don't use free proxies! ipipgo's commercial-grade proxy pool can reach a survival rate of 98%, and their system will automatically reject and replenish new IPs when they encounter invalid IPs.

Q: What if I need to handle both PC and M stations?
A: With the terminal type parameter of ipipgo, you can specify the mobile/landline IP to get the corresponding version of the web structure.

Q: The XML Parser Library always reports encoding errors?
A: 80% of the site is enabled Gzip compression, remember to add Accept-Encoding in the request header, or directly use ipipgo's intelligent decompression proxy service.

Say something from the heart.

Engage in data collection is like guerrilla warfare, the site's anti-climbing measures are upgraded twice a day. With ipipgo proxy service for two years, the biggest feeling is thatsteady as a dogThe smart routing system of theirs is really something. That intelligent routing system of theirs is really something, which can automatically match the best exit node according to the target website. Especially when dealing with government websites, using their government-specific IP segments, the success rate is straight up full.

One final note to newbies: don't save money on proxy configuration! Instead of wasting time by tossing free proxies, why don't you just use ipipgo's ready-made solutions? People provide 7 × 24 hours of technical support, encounter problems at any time to find people, this is the real worry.