Proxy IP Crawler: Proxy Crawler Tool Development and Use

I. Why do proxy crawlers do this stuff?

Do data crawl brother should understand that the target site's anti-climbing mechanism is like a watchdog, catching high-frequency visits to the IP block.proxy IP poolIt is your cloak of invisibility, especially when doing e-commerce price comparison, public opinion monitoring these scenes that require high-frequency operation. To cite a chestnut, one time I tested to capture the price of a clothing site, the local IP half an hour to be pulled black, replaced with dynamic residential IP froze after three days of running did not turn over.

Second, is it hard to rub a proxy crawler yourself?

Getting a basic version is really simple, focusing onIP Validity Verificationrespond in singingAutomatic switching mechanism. Here's a Python example given with the requests library + random proxy access:

import requests
from itertools import cycle

proxies = [
    'http://user:pass@ip:port', 'socks5://user:pass@ip:port'
    'socks5://user:pass@ip:port'
]
proxy_pool = cycle(proxies)

for _ in range(5): current_proxy = next(proxy_pool)
    current_proxy = next(proxy_pool)
    try: current_proxy = next(proxy_pool)
        response = requests.get('destination URL', proxies={"http": current_proxy}, timeout=10)
        print(f "Successful access! Current proxy: {current_proxy}")
    except.
        print(f "Proxy failed, switching automatically: {current_proxy}")

Note that there are three exceptions to be handled here:Connection timeout,authentication failure,Proxy server down. Suggested to single out the verification session and make it a timed task, don't wait to use it only to realize that the IP is cold.

Third, off-the-shelf tools to save time or their own development cost-effective?

Here's a decision table to take a look at:

Personal experience: if it's just a temporary project, just use theAPI interface for ipipgoIt smells even better, and their TK dedicated latency can be squeezed to within 150ms, much more stable than a self-built proxy pool.

Fourth, avoid these pits can less hair loss

1. Don't be cheap and use free proxiesLast year, I tested an open source proxy pool, and 19 out of 21 IPs were broilers, and the data was directly hijacked.
2. Don't get your protocols mixed up.: http proxy to access https website will report SSL error, this time to change the tunneling proxy
3. Pay attention to IP purity: Some residential IPs may be specially tagged by the target website, it is recommended to use ipipgo'sDedicated Static IPprogrammatic

V. QA session

Q：What should I do if my proxy IP suddenly fails?
A: First check the account balance and expiration date, then use ipipgo'sReal-time monitoring interfaceBatch detection of survival rate, it is recommended to automatically update the IP pool in the early hours of each day

Q: How do I break the human verification when I encounter it?
A: This situation is not enough to simply change the IP, you need to work with the browser fingerprinting camouflage. ipipgo'sCross-border Private Line IPBring your own browser environment simulation, personally tested a ticket site verification pass rate increase 60%

Q: What package should I choose for my enterprise level project?
A: If the amount of data exceeds 50GB/month, directly on theDynamic Residential (Enterprise Edition)The $9.47/GB is less than the cost of building your own server, and you don't have to worry about IP cleansing!

Sixth, say something heartfelt

Agent tool is a wrench in the end, the key depends on how you use. Recently helped a friend tune cross-border e-commerce crawler with ipipgo'sStatic Residential IPCombined with request rate control, froze the average daily number of IP blocks from 17 to 0. Remember the three key points:Rotate at the right pace,IP quality should be hard,Handle exceptions with careAll that's left to do is to fight with the target site.

Finally, a piece of cold knowledge: some websites will recognize proxies by their TCP protocol fingerprints, so you'll have to use theSocks5 Proxy+ protocol obfuscation. In this regard, ipipgo's client comes with an anti-recognition mode, so you don't have to toss the protocol stack yourself, which saves you a lot of work.