IP Address Rotation: Distributed Crawler Anti-Blocking Solution

What does IP address rotation really do?

Anyone who has done data collection understands that the biggest headache is theI just climbed two pages and got my IP blockedThe first thing you need to do is to get your hands on a website that has a lot of information. To put it bluntly, the site to see you a crazy IP access, direct black no negotiation. This time we have to play the "face" game - so that different IP work in turn, which is the core of the IP address rotation.

To give a real scenario: last year there was a team doing e-commerce price comparison, using a single IP to capture commodity information, and as a result, it was blocked every 20 minutes. After changing to use ipipgo's dynamic proxy pool, it was possible to get the information viaAutomatic IP switching per requestThe protection mechanism was not triggered by 12 hours of continuous work.

Distributed Crawler + Proxy IP = Golden Partner

Distributed crawlers inherently have the advantage of multiple nodes, but it would be a waste of distributed architecture if all nodes used the same exit IP. The correct way to open it should be like this:

 Python Sample Code
import requests
from itertools import cycle

proxies = cycle(ipipgo.get_proxy_pool()) Get a dynamic IP pool from ipipgo.

def crawler(url): current_proxy = next(proxies)
    current_proxy = next(proxies)
    try.
        current_proxy = next(proxies) try: response = requests.get(url,
            proxies={"http": current_proxy, "https": current_proxy}, headers={"User-Agent": "Random UA" } remember
            headers={"User-Agent": "Random UA"} Remember to change the UA at the same time!
        )
        return response.text
    except.
        ipipgo.report_failure(current_proxy) Failed IPs are reported in a timely manner

Note three key points:
1. IP pool to be dynamically updated(ipipgo supports real-time API access)
2. Each request must change IP + change UA
3. Failed IP should be eliminated immediately

The five minefields of choosing a proxy IP

Special note: ipipgo'sResidential Proxy IPComes with real home broadband attributes, more difficult to be recognized than the server room IP, pro-tested in crawling a social platform, the survival rate is more than 3 times higher than the ordinary proxy.

A practical guide to avoiding the pit

I've seen too many cases of people using proxy IPs to the detriment of others, so I'll tell you a few things that are easy to fall into:

1. Don't switch too often.-Don't do the whole 30 seconds on time IP change, random interval is the king!
2. Attention to concurrency control--Even if you have 100 IPs, don't have 100 threads open at the same time!
3. There's something to be said for geographical selection--Don't use overseas IPs if you are catching domestic sites.
4. Remember to simulate normal traffic-Don't just grab the data, visit the home page and details page occasionally!

You ask, I answer.

Q: Will using a proxy IP slow down the speed?
A: Good question! It depends on the proxy quality. Like ipipgo's BGP line proxy, the measured latency can be controlled within 200ms, which is faster than many self-built proxies.

Q: Do I need to maintain my own IP pool?
A: Never! Leave the professional work to the professionals. ipipgo's API returns verified and available IPs, which is ten times less hassle than maintaining it yourself.

Q: What should I do if I encounter a CAPTCHA?
A: Two options: 1) Reduce the frequency of requests 2) Cooperate with the coding platform. But with ipipgo's high quality IP, the probability of triggering CAPTCHA will be much lower.

Finally said a hollow: IP rotation is not a panacea, have to cooperate with the request frequency control, UA camouflage, behavior simulation and other combinations. It is recommended to use ipipgo firstFree Trial PackageTest the results and don't rush to buy a big package. After all, what suits you is best, don't you think?