Global Crawler Proxy: Global IP Proxy Rotation Solution for Distributed Crawler Systems

Crawlers know the pain.

What are the friends who do data collection most afraid of? The hard-written crawler is suddenly strangled by the target website while running, and the IP address is blacklisted. At this time, you will find that if you don't have enough IP resources at hand, the whole project progress will come to a halt.

举个真实案例：去年有个做电商比价的小团队，他们用固定IP抓取商品信息，结果第三天就触发了网站的反爬机制。开发小哥连夜改代码加，结果发现根本问题出在IP ReuseThis dead center on.

IP Management in Distributed Systems

While traditional standalone crawlers with IP rotation are like a one-way bridge across a river, distributed systems are more like bridge-building teams. There is a key point here that is easily overlooked:IP state synchronization between nodesThe first thing you need to do is to think of five crawler nodes working on their own. Imagine five crawler nodes each working on their own, possibly accessing the site at the same time with the same IP, isn't that shooting yourself in the foot?

At this time there is a need for a centralized scheduling system, similar to the traffic command station. For example, using Redis to survive the IP pool, each node to take the IP first "number", after the use of the website response status to decide whether to recover. Here insert a hardcopy, likeipipgoThe residential proxy pool supports APIs to fetch available IPs in real time, which works just fine with this scheduling mechanism.

Dynamic static IP how to choose not to step on the pit!

Many newcomers are prone to dynamic/static IP selection, here is a practical comparison table:

Focus on tips for applying dynamic IPs. For example, usingipipgoWith the on-demand allocation mode, you can set up automatic IP switching for each request, and test the anti-climbing strategy of a news website, when the interval between single-IP accesses is more than 30 seconds, the survival cycle of dynamic IP can be extended by more than 3 times.

Six Tips for Staying Alive in the Real World

1. Hot and cold IP partition management: Separate freshly used and idle IPs, like a hot pot with mandarin ducks!

2. Tagging each IP: record the number of blocked times, response speed and other data

3. Don't believe in millisecond switching: there is still a reading time for people to visit a website.

4. pay attention to protocol matching: https site do not use only support http proxy

5. Setting up a fusion mechanism: if an IP fails three times in a row, it will be quarantined automatically.

6. Make good use of geographical features: for example, use local residential IPs to collect local information.

Speaking of geographical distribution.ipipgoThere is a killer feature - support for filtering IP by city granularity. last year to help a real estate platform to do data collection, is to rely on this function to accurately obtain the price fluctuations of different neighborhoods.

What to do when you run into these potholes

QA time:

Q: Obviously changed IP or still recognized?
A: Check the X-Forwarded-For field in the request header, some proxy service providers will leak the real IP.ipipgoThe high stash of agents will automatically handle these details

Q：How can I emergency my proxy IP when it suddenly fails?
A: It is recommended to set up a double authentication mechanism, first send a head request probe with 1 IP, make sure it is available and then launch a formal request.

Q: How can I tell when it's time to change IP pools?
A: monitor these two indicators: ① the average survival time of a single IP dropped 30% ② the frequency of CAPTCHA suddenly increased

Engage in crawlers is like fighting guerrilla warfare, both will attack and know how to retreat. In the end, choose the right proxy service provider can save a large part of the worry.ipipgoThe smart routing feature has a hidden trick - it automatically switches the alternate channel when it encounters a sudden block, which works especially well in the early hours of the morning when there is a sudden increase in data.

Lastly, I would like to remind the newbie friends: don't wait for the IP to be blocked before you remember to change the proxy, good protection is proactive. Like driving a car to wear a seatbelt, do not wait for the crash only to regret. Now each agent service providers have a trial channel, it is recommended to do their own hands to test the effect of different scenarios, after all, practice makes perfect.