Search engine crawler agent: avoid being blocked IP rotation and frequency control

Why are crawlers always blocked? Eighty percent of the IP is exposed

Do search engine crawler brothers have had this experience: obviously code written slip, the results run suddenly blocked. At this time do not rush to scold the platform, first look at their own IP is not exposed. Like going to the supermarket to try to eat, if you go to fifty times a day and wear the same clothes, the security guards do not stare at you to stare at who?

It's now available on all mainstream platformsIP Fingerprint Identification SystemThe most important thing is that you can identify the machine traffic through the access frequency and time pattern. I have seen the most extreme case: a company with a fixed IP every day at 3:00 am on time to open the crawl, the results of three days to be blocked, along with the entire C section of the IP into the blacklist.

Second, the three major practical skills of IP rotation

Tip 1: Combine movement and play mix and match
Dynamic IPs are like extras for high frequency short duration tasks. For example, ipipgo's dynamic residential proxies can change to a new IP for every request, and the resource pool of 90 million+ is simply inexhaustible. But when it comes to scenarios that require login status, you have to use static IPs, like their static residential proxies that can keep IPs stable for more than 12 hours.

 Python Example: Hybrid Proxy Use
import requests

def smart_proxy().
     Dynamic proxy for data collection
    dynamic_proxy = "http://user:pass@proxy.ipipgo.com:3000"
    requests.get("https://target.com", proxies={"http": dynamic_proxy})

     Static proxy for login hold
    static_proxy = "http://user:pass@static.ipipgo.com:4000"
    session = requests.Session()
    session.post("https://target.com/login", proxies={"http": static_proxy})

Tip 2: Geolocation should be realistic
Don't make the crawler look like an instantaneous superman. If you want to crawl a US website, remember to locate the proxy to a specific state. ipipgo supports city-level localization, so use the New York IP to crawl New York data, and with local time zone access, the realism is directly pulled full.

Tip 3: Failure to switch automatically
Prepare a proxy pool monitoring script, found that a certain IP response slows down or return CAPTCHA, immediately kicked out of the current queue. Here's a tip: divide the proxy IP into multiple groups and rotate them to avoid total annihilation.

III. Core Mindfulness for Frequency Control

Don't be superstitious about fixed intervals! There is randomness in human operations. It is recommended to use正态分布随机, e.g. on average 3 seconds to tap, but the actual interval fluctuates between 1-5 seconds. Take a look at a comparison table:

When you encounter situations where you must have high-frequency access, you can use ipipgo's enterprise-grade dynamic proxy, which supports 100+ requests per second. But remember to cooperate withtraffic dispersion strategy, splitting the task into multiple subtasks that are processed in parallel through different agent channels.

IV. QA First Aid Kit

Q: What should I do if I use a proxy IP and still get blocked?
A: Check three elements: ① IP is pure (do not use the data center proxy) ② whether the session with cookies and other fingerprints ③ whether there is unconventional traffic characteristics. It is recommended to use ipipgo's residential proxy, their IPs are from real home networks.

Q: What if I need to maintain the session for a long time?
A: Choose static residential proxy, ipipgo's static proxy supports 12 hours of constant IP. If it is a scenario that requires a few days of stable connection, you can contact their home to customize a long time package.

Q: How do I test if the agent is valid?
A: Don't use ping test directly, some platforms will block ICMP. you should use the robots.txt of the target website as a probe:

def check_proxy(proxy).
    try.
        res = requests.get("https://target.com/robots.txt",
                          proxies={"http":proxy},
                          timeout=5)
        return res.status_code == 200
    except.
        return False

Fifth, choose the agent to see these doorways

Agency services on the market are a mixed bag, to teach you a few tricks to avoid the pit guide:

1. Look at the IP typeResidential proxies > server room proxies, ipipgo's proxies are real home broadband IPs!
2. See protocol support: at least support SOCKS5, they even have Websocket compatibility!
3. Depends on the billing method: per traffic billing than the number of IP is really, especially when crawling picture video
4. Look at the positioning accuracy: don't use the national level if you can pinpoint the city, ipipgo can even get the IP of a small town in the U.S.

Recently helped customers do Google crawler, with ipipgo's dynamic residential agent + their SERP API, directly eliminating the parsing link. Tested continuous collection for a week did not trigger the verification, the customer said that early use of this program can be less than half of the hair.