Building an Anti-Blocking Crawler System from Scratch: A Guide to Proxy Configuration

当爬虫撞上封禁？试试这招保命套路

Crawler old drivers understand that the biggest headache is the target site suddenly give you an IP ban. Last week I helped a friend to deal with a case: their company to climb the bidding information, three consecutive days on time was blocked, anxious technical department jumped straight to the feet. This is the time to invite the protagonist of today's talk - theFlexible use of proxy IPsThe

Must-see agent type literacy for newbies

There are three main types of agents on the market, and choosing the right type can lead to less trouble:

For example, like the ipipgo family ofDynamic residential agent poolIn the past, when collecting a certain e-commerce platform, the blocking was not triggered for 48 hours in a row. Their IP survival cycle is controlled in about 20 minutes of automatic switching, perfectly adapted to the need for frequent replacement of the scene.

Four Steps to Real-World Configuration

Here's an example of Python's requests library, but the principle is general:

1. first in the ipipgo background to generate API key
2. Use theirIntelligent Routing InterfaceGet the latest proxies
3. Configure automatic retry mechanism (3 retries recommended)
4. Set random request intervals (don't be stupid and make fixed requests per second)

import requests
from retrying import retry

def get_proxy(): return ipipgo.get_proxy()
    return ipipgo.get_proxy() This replaces the real interface

@retry(stop_max_attempt_number=3)
def crawler(url).
    proxy = {"http": get_proxy(), "https": get_proxy()}
    return requests.get(url, proxies=proxy, timeout=10)

Dynamic Forwarding Strategies Revealed

Don't think that just because you've hooked up an agent that everything is going to be fine, I've seen too many people fall prey to forwarding tactics. Remember three key points:

- Concurrency not to exceed 60% of the total agent pool(e.g. have 100 IPs and use up to 60 at the same time)
- Automatic elimination of slow IPs based on response speed (those exceeding 3 seconds are directly thrown into the blacklist)
- Reduce the frequency of changes appropriately from 2-5 a.m. (this is when the anti-climbing mechanism usually relaxes as well)

ipipgo has one.Intelligent Scheduling FunctionQuite practical, according to the response of the target site to automatically adjust the strategy. The last time I collected a news site, the collection efficiency was directly doubled after turning on this feature.

Frequently Asked Questions First Aid Kit

Q: What should I do if the proxies suddenly fail en masse?
A: First check if the request header carries the real IP, then check the certificate validation settings. It is recommended to use the ipipgo providedTunnel Proxy ModelThe SSL certificate issue can be handled automatically.

Q: How do I judge the quality of an agent?
A: Focus on three indicators: response success rate (>95%), average delay (<2 seconds), the number of geographic distribution. ipipgo background data panel can directly view these indicators.

Q: How do I match multiple threads so they don't conflict?
A: Rememberone thread one agentprinciple, never share the same IP with multiple threads. it is recommended to use theirSession Holding Agent, which can automatically bind threads to IPs.

The Ultimate in Anti-Banning

One final trick:Mixing Multiple Agent Types. For example, the server room agent is used to handle image downloads, the residential agent is used to handle API requests, and then the mobile agent is used to handle the key authentication links. Under such multiple disguises, the blocking mechanism will basically become a pose.

Picking a reliable service provider is fundamental. A service provider like ipipgo that canCustomize agent policies by business scenariosthat are so much better than the ones that only sell fixed packages. They recently went live withRequest feature disguise function, even the TCP fingerprints can be simulated, it's kind of the anti-blocking to the bone.

In the end, anti-blocking crawlers is a game of offense and defense. As long as you master the Swiss army knife of the agent, together with a reasonable strategy, you can basically take care of the 90% banning problem. The rest of the 10%, may have to change a posture to fight again in the jianghu.