Crawler agent: automated data collection anti-blocking IP rotation system building

Why do crawlers always get banned? Maybe you didn't learn how to "change your armor".

The old iron engaged in crawler's biggest headache, is the hard work of writing a crawler suddenly hiccups. The server side is like a long eye like, caught your IP to the dead block. At this time you need to master the "change armor" of the masterpiece - to put it bluntly is the proxy IP rotation.

There are a lot of tutorials on the market that teach people to use free proxies, and that stuff is just like the candy canes on the roadside stalls, which looks red hot but actually hurts your teeth. the IP quality is poor, the speed is slow, not to mention that it may also leak the data. This is the time to look for professional players, such asipipgoThis kind of service provider specializing in proxy IP, his family of more than 90 million residential IP, more than 240 regions around the world at random, just like playing a real-life version of chicken at any time to change.

Proxy IP rotation system setup in four steps

Step 1: Pick the right equipment pool
Don't use those public proxy lists for the same reason you don't go to a public restroom to find ingredients. Suggest going straight toipipgoThe API interface, people's residential IP pool are alive and kicking real IP, but also support socks5/http/https full protocol. Remember to choose the dynamic residential IP, this IP survival time is short, sealed also does not hurt.

Step 2: Get a smart dispatcher
Write your own proxy middleware, or use off-the-shelf scrapy-proxies. the point is to set up:

• Failure automatic switching: change IP if 3 consecutive requests fail
• Random delay: 0.5-3 seconds of random pauses to act like a real person
• Geographic rotation: e.g. use a US IP today, cut a German IP tomorrow

Step 3: Mask the Crawler
It's not enough to just switch IPs, remember that every time you switch:

1. Empty browser fingerprints
2. Replacement of User-Agent
3. Randomize mouse track (when doing js rendering)

Step 4: Get an early warning sentry
Deploy a monitoring script to check regularly:

A practical guide to avoiding the pit

Case 1: E-commerce price monitoring
An e-commerce platform blocks IPs every 5 minutes. Use theipipgoThe dynamic IP pool + automatic switching strategy every 4 minutes, successful continuous collection for 72 hours. The key point is to set the IP switching interval smaller than the blocking period.

Case 2: Social Media Capture
When encountering scenarios where you need to log in, remember to bind a fixed geographic IP to each account. for example, if you have a U.S. account, you can use a fixed residential IP in New York, which can effectively avoid account anomalies.

Frequently Asked Questions QA

Q: What should I do if my proxy IP is slow?
A: Prioritize IP nodes that are close to the target server.ipipgoIt supports filtering IPs by city granularity, for example, if you want to climb Tokyo's website, you can directly choose their Tokyo residential IPs.

Q: How do I know if the agent is valid?
A: Write your own detection script and use the robots.txt of the target site as a probe. 10 consecutive visits are returned to 200 status code to be qualified.

Q：How to deal with IP blocked?
A: Immediately move the IP into the cooler and re-enable it after 12 hours. Also adjust the request frequency, it is recommended toipipgoThe backend enables automatic elimination of unavailable IPs.

Getting a crawler is like fighting a guerrilla war, the key is tolit. shoot one shot and move to another location (idiom); fig. to make a clean sweep.. Use a good proxy IP rotation system withipipgoThis reliable "arms supplier", in order to be invincible in this war of attack and defense. Remember, there is no seal can not be killed crawler, only will not change the vest of the program apes!