Web page crawling paging: paging data crawling program

First, paging crawl for why always stuck? First find the problem and then solve it

Many brothers in the data crawl, encounter paging headache. For example, e-commerce site's product list, obviously looking at 100 pages of data, the results of the crawl to the fifth page of the IP is blocked. this time do not rush to change the crawler framework.The root of the problem is often in IP exposureThe

The traditional approach is to reduce the frequency of requests, but this is too inefficient. A smarter approach is to "vest" each paging request - access it with a different proxy IP. It's like going out in different clothes every day, so the security guards don't recognize you as the same person.

import requests
from itertools import cycle

 Dynamic proxy pool provided by ipipgo (example)
proxies = [
    "http://user:pass@gateway.ipipgo.com:8001",
    "http://user:pass@gateway.ipipgo.com:8002", ...
     ... More IPs
]
proxy_pool = cycle(proxies)

for page in range(1, 101): current_proxy = next(proxy_pool)
    current_proxy = next(proxy_pool)
    current_proxy = next(proxy_pool)
        response = requests.get(
            f "https://example.com/products?page={page}",
            proxies={"http": current_proxy}
        )
         Processing data...
    except Exception as e.
        print(f "Error capturing page {page}, switching IPs automatically")

Second, paging parameters of the fancy crack method

The paging mechanism of different websites is like different styles of locks, you have to use the corresponding key to open them:

Focusing on the most difficult encryption parameter, such sites will carry encrypted tokens in the paging request. this time it is recommended to use ipipgo'sLong-lasting static IP, together with the randomization of the request interval (e.g., stopping for 3-7 seconds), can effectively avoid being recognized.

Third, the proxy IP of the actual match skills

Using a good proxy IP is like mastering the fire in a stir-fry, a few key points:

1. Rotation tempo should be randomizedDon't fix IP change every 5 pages, you can set it to switch randomly from 3 to 8 pages.
2. Protocol type to counterparts </ strong: encounter HTTPS site must use https proxy, this point ipipgo's proxy support dual protocols
3. Failure to retry with toggle: Immediate abandonment of an IP after 2 consecutive failures