python dynamic web crawler: Python crawler dynamic IP automatic switching practice

When the crawler meets dynamic IP: this time really stable

Recently, an e-commerce friend complained to me that his crawler was always blocked by the target site IP, so he wanted to drop the keyboard. In fact, this is just like a gopher - the site blocked an IP, we will continue to do a new one. Today, let's get our hands on a meetingAutomatically change vestsof the crawler, use ipipgo's proxy IP service to break this.

What does a dynamic IP really do?

As a chestnut, a webmaster finds a certain IP crawling like crazy for data, and just blocks that door number. Dynamic IPs are like giving the crawler a bunch ofDoor numbers that distort, a new identity every time you visit. ipipgo's dynamic residential IPs come from real home broadband and are harder to recognize than server room IPs.

import requests
from itertools import cycle

 Proxy pool from ipipgo
proxies = [
    'http://user:pass@proxy1.ipipgo.com:8000',
    'http://user:pass@proxy2.ipipgo.com:8000', ...
     ... More proxies
]
proxy_pool = cycle(proxies)

def smart_crawler(url):
    for _ in range(3): failure retry mechanism
        current_proxy = next(proxy_pool)
        current_proxy = next(proxy_pool): fail_retry_mechanism
            resp = requests.get(url, proxies={'http': current_proxy}, timeout=10)
            return resp.text
        except.
            print(f"{current_proxy} Failed, switching to next IP automatically")

Four Steps to Practice

Step 1: Prepare an ammunition stockpile
Go to the official ipipgo website and register, then find the back officeAPI Extraction Links.. We recommend going with the Dynamic Residential (Standard) package, with $7.67/GB pricing for programs just getting started.

Step 2: Get a crawler that changes faces
Using Python's polling mechanism with a pool of proxies is like putting an auto-change button on a crawler. Take care to set up a reasonablerequest interval, don't let the site think you're doing a raid.

Common Rollover Scene QA

Q：Why was I blocked even though I used a proxy?
A: 80% of the IP quality is not good. Don't be cheap and use free proxies. ipipgo's residential IPs come with real carrier information, like wearing an invisibility cloak.

Q: Which package should I choose?
A: Use Dynamic Standard Edition ($7.67/GB) for small data volume, and choose Static Residential ($35/IP) for those who need stable IP. Enterprise-level projects directly on the dynamic enterprise version, there is an exclusive channel.

Why ipipgo?

this oneTK LineIt is a true fragrance, specifically optimized for certain difficult websites. The last time I helped a friend do cross-border e-commerce data collection, I used their cross-border line to directly save 30% IP consumption.

Finally said a lesson in tears: do not write a dead proxy IP in the code! Once I tried to save trouble and directly write a fixed IP, the result is that the IP was blocked after the whole script directly strike. Now I've learned my lesson, and every time I make a request, I get the latest IP pool dynamically from ipipgo's API, and it's a lot more stable.