Python Crawler: Integrated Proxy IP Collection Solution

First, why is the crawler always locked up in a small black room?

Engaged in the crawler know, the most headache is suddenly received 403 Forbidden. frankly speaking, the site administrator is not vegetarian, they use IP frequency monitoring is like the gate installed face recognition. To cite a chestnut, the same IP continuous access to an e-commerce site 50 times, Ironclad triggered anti-climbing mechanism.

at this momentproxy IPJust like a Sichuan opera singer who changes his face, he changes his "face" every time he visits. This is especially true for people likeipipgoSuch service providers that offer dynamic residential proxies have hundreds of thousands of real home broadband addresses stored in their IP pools, which are much more reliable than server room IPs.

Second, hand to teach you to ride the agent pool

It's too much work to raise proxy IPs on your own, so you might as well just interface with an off-the-shelf API.Universal collection template::

import requests
from random import choice

def get_proxy().
     Interface to ipipgo's API
    resp = requests.get('https://api.ipipgo.com/dynamic?format=json')
    return f"{resp.json()['ip']}:{resp.json()['port']}"

def crawler(url):
    proxies = {
        "http": "http://" + get_proxy(),
        "https": "http://" + get_proxy()
    }
    try.
        response = requests.get(url, proxies=proxies, timeout=10)
        return response.text
    except Exception as e.
        print(f "This time it rolled over, change to the next IP | error message: {str(e)}")
        return crawler(url) auto-retry

Highlight it three times:stochastic switching,Exception handling,auto-retry! With ipipgo's polling strategy, each request is randomly drawn from a pool of millions of IPs, which is ten times more stable than a fixed IP.

III. Guide to avoiding pitfalls in actual combat

Recently helped a friend to get e-commerce price monitoring, using ipipgo'sSession-holding agentsEspecially fragrant. Their smart routing guarantees the same exit IP for 30 minutes, perfect for sites that require a login state.

Here's our configuration parameter sheet:

IV. Question-and-answer session

Q: What can I do about slow proxy IPs?
A: It is important to choose the right protocol! ipipgo's SOCKS5 agent is 30% faster than HTTP, especially when collecting pictures and videos, the speed difference is especially obvious.

Q: How do I test if the proxy is valid?
A: Write a timed task to check connectivity:

def check_proxy(proxy).
    try.
        requests.get('http://httpbin.org/ip',
                    proxies={"http": proxy},
                    timeout=5)
        return True
    except.
        return False

Q: Why do you recommend ipipgo?
A: three hardcore reasons: ① real residential IP does not expire ② automatic switching does not need to manually maintain ③ a professional technical support team to save the day at any time

The last nagging sentence, using a proxy is not a gold medal, to control the frequency of access is the king. The ipipgo intelligent scheduling and custom rules with the use of the basic can handle 90% crawler scene. If you run into a difficult site, try theirHigh anonymity mode, even the X-Forwarded-For header gives you a clear disguise.