Crawler Techniques Collecting Data Article|Crawler Techniques Collecting Data Tutorial Anti-Crawler Strategy Analysis

First, why is the crawler always blocked? First to understand these routines

Brothers engaged in crawling have encountered this situation: just grabbed two pages of data, the server will block your IP. In fact, this is a reason with the cell access control, security found that people frequently in and out of the natural suspicion is to send a flyer. The site is also through theFrequency of visits, request patterns, IP affiliationThese features identify the crawler.

For example, the product details page of a treasure, ordinary people look at up to 10 products per minute, if you use the same IP request 20 times per second, immediately triggered the protection mechanism. What's more, some websites will checkBrowser FingerprintingEven if you have changed your IP address, you will still be exposed if your operating habits are too regular.

II. Proxy IP's practical application manual

This is where a proxy service like ipipgo comes in to play along. Their residential IP pool has over 90 million real home network resources that are harder to recognize than server room IPs. How exactly does it work? Remember these three core operations:

1. IP rotation tempo control

Don't change IPs wildly like a gopher, it's recommended to change every 50-200 pages you catch. When you use ipipgo's Dynamic Residential IP, their API can automatically assign a new address, remember to set it in the code!随机（0.8-3秒）, mimicking the browsing intervals of real people.

2. Request header camouflage in place

Instead of using Python's default User-Agent, go online and find 20 common browser logos to rotate through. It's recommended to keep the headers information in a list and randomly pick one for each request, like this:

headers_list = [
"Mozilla/5.0 (Windows NT 10.0)...",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7)..."
]

Third, the anti-anti-crawl advanced tawdry operation

Don't panic when it comes to CAPTCHA, use ipipgo's region-specific IPs with automated tools. For example, to catch a website in North America, pick their US home IP, many verification systems will relax restrictions on their home IP.

When you come across a website that detects mouse tracks, don't use headless mode directly. On Puppeteer and other tools that can simulate the real click path, remember to turn on the ipipgo backgroundHTTP/HTTPS full protocol supportto avoid protocol mismatches from being intercepted.

IV. First aid guide to common rollover scenes

Q: What should I do if I can't connect to the proxy IP?
A: First check the whitelist settings, ipipgo supports automatic binding of server IP. then test whether the local network can ping through the proxy server, some areas need to switch the connection protocol.

Q: Obviously using a proxy and still being blocked?
A: It is possible that the cookie leaks the real identity, and it is recommended to synchronize and clean the local storage every time you change the IP. Also check if WebRTC leakage protection is enabled, this will expose the real IP.

Q：动态IP太高影响效率？
A: Enable smart route optimization in ipipgo background, their BGP lines can automatically select the best node. You can also set the timeout to 15-30 seconds to avoid frequent retries.

Fifth, choose the right tools to go three years less

Having used seven or eight agency services, ipipgo's residential IP resources are indeed wild enough. The last time I did cross-border e-commerce data collection, I used their Canadian residential IP to catch the price of competing products, and it ran for a week without interruption. Especially the dynamic IP survival time, measured than the labeled also longer than about half an hour.

Highlighting theirpinpointing functionThe last time I needed a certain niche IP in a third-tier city, I picked the district-level geographic code in the background and was surprised to see that it really had resources. This kind of granularity of coverage, in catching geographically limited content is simply open.

Toss crawler these years, the biggest realization is: rather than spend time researching cracking algorithms, it is better to invest more in IP resources. After all, the website protection system is no longer intelligent, but also can not hold you with real users to visit the network. If you choose a reliable proxy service, a lot of problems will not appear.