The Ultimate Guide to Crawler APIs: Automated Data Collection in Action

The Real State of Survival for Crawler Engineers

Do data collection brothers understand that the site anti-climbing is now more and more perverted. Last week, a friend who does e-commerce price comparison told me that he had just written a good crawler script to run less than two hours, the IP will be blocked to mom do not recognize. Even worse is a recruitment data platform, with a cloud server to run collection directly by the other side of the black entire machine room section. At this time we have to offer our killer app -proxy IP poolIt's like putting a chameleon skin on a crawler, so the target site can't even figure out where you're really coming from.

Proxy IP in the end how to choose reliable

There are so many proxy service providers on the market, but there are more pits than you can imagine. Last year I used a certain claimed million IP pool, the results of 30% are duplicate addresses. Here to teach you three hardcore screening criteria:

Here's the kicker.IP purityI'm not sure if you're a newbie, but I'm sure you're a newbie. Some proxy IPs have long been labeled by major websites as dedicated to crawlers, and using them is tantamount to shooting oneself in the foot. Like ipipgo their home IP are mixed residential + data center resources, each request User-Agent will also automatically match the type of equipment, this detail can significantly reduce the probability of being identified.

Hands-on building of intelligent agent system

Just have a proxy IP will not be used is useless, here to share a practical configuration program (take Python requests as an example):

  
proxies = {
    'http': 'http://用户名:密码@gateway.ipipgo.com:端口',
    'https': 'http://用户名:密码@gateway.ipipgo.com:端口'
}
response = requests.get(url, proxies=proxies, timeout=10)  

Be careful to puttimeoutrespond in singingRetesting mechanismDoing well, it is recommended to work with the API provided by ipipgo to get IPs dynamically. they have a pretty useful feature calledIntelligent RoutingIt can automatically switch the optimal node according to the region where the target website is located, which is much less troublesome than switching manually.

Must-have anti-blocking tips

Name a few easy points to step on:
1. Don't request at fixed intervals, add random delays (fluctuating between 0.5-3 seconds)
2. Headers in the Accept-Encoding remember to add gzip, a lot of crawlers newbies here exposed
3. Don't fight hard when encountering CAPTCHA, immediately switch IP and reduce the collection frequency.
4. Say what is important three times:Hold with the session! Hold with the session! Hold with the session!

Frequently Asked Questions QA

Q: What should I do if the proxy IP is invalid after using it?

A: This means that the quality of the IP pool is not good, ipipgo's nodes have all theHeartbeat DetectionThe product is automatically replaced 15 seconds before it expires, and it has been tested to run continuously for 12 hours without dropping out.

Q: How can I tell if an agent has been flagged by a website?

A: 3 consecutive requests return 403 or jump CAPTCHA, you should change IP. It is recommended to add an automatic meltdown mechanism in the code, detecting anomalies directly away from the ipipgo API for a new IP!

Q: Will it conflict to have more than one crawler on at the same time?

A: If using ipipgo'smultichannel concurrencyfunction, each crawler thread goes independent IP channel, will not interfere with each other at all. They can also distinguish the use of statistics by project in the background, especially friendly to teamwork!

Finally, to tell the truth, the right proxy service provider can save at least 50% debugging time. Like ipipgo provides a complete solution, from IP acquisition to management and monitoring of a one-stop solution, than to build their own proxy pool cost-effective. In particular, theirFlow traceabilityfeature to clearly see how each IP is being used, which is a lifesaver for troubleshooting.