Web Crawler: Automated Collection System Architecture

Why do reptiles always get pinched?

The old iron of data collection understand that the anti-crawl mechanism of the target site is like a Sichuan opera singer who can change his face. Last week, the script can still run, this week suddenly give you 403 big gift. Let's take an e-commerce platform as an example, their family's wind control system can pass theRequest frequency, device fingerprints, IP tracesThree locks keep the creeps out.

This time you need to use the proxy IP to play the "game of disguise". As if each visit to change a new vest, so that the target site thought it was a different user in the operation. But the proxy services on the market are uneven, some even basic anonymity can not do, with the use of the use will be recognized.

Four-layer architecture builds an invulnerable body

Our self-developed acquisition system can be split into four major modules:

+----------------+ +-----------------+
| Task Scheduler | → | IP Proxy Manager |
+----------------+ +-----------------+
       ↓ ↓
+----------------+ +-----------------+
| Data Cleansing Pipeline | ← | Distributed Collection Nodes |
+----------------+ +-----------------+

Highlight.IP Proxy ManagerThis core component. It has to do three things:
1. Real-time monitoring of IP availability (don't let failing IPs slow you down)
2. Intelligent switching strategies (when and how to switch)
3. Traffic cost control (don't blow the budget)

The Three Fateful Things About Choosing a Proxy IP

Comparison of common agent types on the market:

This is a must.ipipgoof their unique technology - their dynamic residential IP pool supportsession holdFunction. For example, when collecting websites that require login, the same IP can maintain the session for 20 minutes without interruption, which is a lifesaver for the collection tasks that need to maintain the login state.

Hands-on with agents in action

Demonstrate how to access ipipgo's proxy service using Python's requests library (remember to replace your own API key):

import requests

def get_proxy().
     Get the latest proxy from ipipgo
    resp = requests.get("https://api.ipipgo.com/get?key=YOUR_KEY")
    return f "http://{resp.text}"

url = "https://target-site.com/data"
proxy = get_proxy()

try.
    response = requests.get(url,
        proxies={"http": proxy, "https": proxy}, timeout=10
        timeout=10
    )
    print(response.text)
except Exception as e.
    print(f "Request failed, automatic IP switching: {str(e)}")
     Here you can add the IP failure flag logic

Focused attention:Don't write a dead proxy IP in your code! Be sure to make it dynamically obtained. ipipgo's API supports filtering by region, operator, and other conditions, which is especially useful for collecting geographic data.

QA First Aid Kit

Q: What should I do if my proxy IP is not working?
A: It is recommended to use the double insurance strategy: ① choose ipipgo such as service providers with automatic melting mechanism ② in the code of the retry mechanism, it is recommended that the combination of 3 retries + IP replacement

Q: How do I break the human verification when I encounter it?
A: three steps: 1. reduce the frequency of requests 2. switch to ipipgo's mobile IP 3. with the browser fingerprinting camouflage (this to be a separate article)

Q: Why do I get blocked even though I use a proxy?
A: 80% of the behavioral characteristics are exposed! Check these points: whether the request header is characterized by a crawler, whether the mouse track is too regular, whether the page stay time is like a robot

Tell the truth.

Data collection is like a cat-and-mouse game, so don't expect to have one solution for everything. Our experience is:
- UA pool updated weekly
- Use ipipgo for important tasks.exclusive IPservice
- Distributed nodes don't bunch up in the same server room
- Higher collection success rate from 2-5am (low site load)

Finally, to remind the novice white: free proxy are pits! As we have tested before, the availability of a free proxy pool is less than 15%, which is not as reliable as dialing up your own broadband for an IP. Professional things to professional people, like ipipgo such as self-built server room provider is the right way.