Web Data Extraction Methods: Web Proxy Data Extraction

I. Why is web page data capture always blocked?

Brothers who engage in data crawling understand that the website anti-climbing mechanism is like a security guard checking ID cards. The same IP high-frequency access, minutes will be shut down in a small black room. To give a real example: last year, there is an e-commerce price comparison team, with their own office network to capture data, the results of the next day the entire company network was the target site black, even normal visits are affected.

This is the time to useProxy IP masquerading as an identity. It's like changing your face every time you knock on the door, making the site think it's a different user visiting. However, many proxy service providers in the market have poor IP quality, just like using poor quality cosmetics - just put on the face and take off the makeup, as usual, to be recognized.

Second, the three major lifeblood of the selection of proxy IP

1. The anonymity level has to be high enoughTransparent proxies expose the real IP, high stash proxies are the real cloak and dagger. Here's a test trick: use a proxy to access whatismyipaddress.com, and see if the displayed IP is completely replaced.

2. Don't step on potholes with protocol matching::

3. There's something to be said for switching tempos.: Don't think it's safe to change your IP frequently. A travel platform once changed IPs 200 times per hour, which triggered an abnormal traffic alert. It is recommended to adjust dynamically according to the response speed of the target website, such as changing IP every 50 pages.

Third, the hand to teach you to use ipipgo actual combat

An example of a Python crawler with ipipgo's dynamic residential proxy:

import requests

proxies = {
    'http': 'http://用户名:密码@gateway.ipipgo.com:端口',
    'https': 'http://用户名:密码@gateway.ipipgo.com:端口'
}

response = requests.get('destination URL', proxies=proxies, timeout=10)
print(response.text)

Guide to avoiding the pitI'm sorry, but I'm not sure if I'm going to be able to do this! There is a buddy did not set the timeout, encountered a slow response to the site directly jammed the entire script. ipipgo's API supports on-demand IP extraction, it is recommended that each request before obtaining a new IP, to avoid repeated use.

IV. QA First Aid Kit

Q: What can I do about slow proxy IPs?
A: Prioritize the local operator resources, such as catching U.S. data with ipipgo's North American line. Don't be greedy and use a free proxy, the speed is comparable to a bicycle on the highway.

Q: What should I do if I am bombarded with CAPTCHAs?
A: Switch to a static residential IP to reduce the frequency of replacement. Last time there is a friend who does real estate data, after switching to ipipgo's static IP, the rate of CAPTCHA appearances dropped straight down 70%

Q: How to match the need for multi-threaded crawling?
A: Use ipipgo's API to get IP pools in bulk, it is recommended that the number of threads does not exceed 1/3 of the total number of IPs. e.g. if there are 300 IPs, it is more stable to open 100 threads.

V. Why do you recommend ipipgo?

Having tested seven or eight proxy providers, ipipgo has two killer features:
1. The TK line smells good.The friends who do cross-border e-commerce understand that certain platforms have perverted requirements for IP purity. After using their TK line, the account survival rate increased from 30% to 85%.
2. Flexible charging model: Small team with dynamic residential standard version, 7.67 yuan / GB enough to grab 100,000 pieces of commodity data. Enterprise-level customers can choose a customized package, support for daily billing

Finally, a big truth: don't expect a set of programs to go all over the world. Last week, I came across a case, do airfare comparison team, the dynamic IP and static IP mixed with different routes with different countries IP, data integrity directly doubled. Specifically how to match, it is recommended to directly find ipipgo technical customer service program, than their own blind toss strong.