Basic Principles of Dynamic Proxy IP

Dynamic proxy IP refers to the behavior of web crawling by constantly changing IP addresses. Traditional web crawlers are often banned by web servers, which requires us to constantly change IP addresses to avoid being blocked. Dynamic Proxy IP is realized by using a proxy server that enables each request to use a different IP address, thus achieving the purpose of hiding the real IP.

import requests
from lxml import etree

# Setting the proxy IP
proxy = {
'http': 'http://127.0.0.1:8000',
'https': 'http://127.0.0.1:8000',
}
response = requests.get('https://www.example.com', proxies=proxy)

How to get dynamic proxy IP

There are many ways to get dynamic proxy IP, the common ones include buying, leasing, self-built proxy pool and so on. Purchase of dynamic proxy IP is usually through a proxy IP service provider, which can obtain high-quality IP resources, but requires a certain cost expenditure. The leasing method refers to the dynamic replacement of IP by renting a proxy server. Self-constructed proxy pool can be built by building a proxy server, obtaining free proxy IP resources from various channels, and then screening and verifying them to finally build your own proxy IP pool.

import requests
from lxml import etree

# Randomly select an IP from a pool of proxies
proxy = get_random_proxy()
response = requests.get('https://www.example.com', proxies=proxy)

Considerations for Dynamic Proxy IP

When using a dynamic proxy IP for web crawling, there are some issues to be aware of. The first is the stability and speed of the proxy IP, you can't use a blocked or slow IP for access. The second is the privacy of the proxy IP, to ensure that the proxy IP obtained will not leak private information. In addition, you also need to pay attention to the legality of the proxy IP, avoid using illegal means to obtain the proxy IP, so as not to violate the law.

Finally before starting a web crawl, make sure that you understand the rules of crawling the website, follow the website's robots.txt protocol, as well as preventing unwanted impacts on the website.

Through the reasonable use of dynamic proxy IP, the success rate and efficiency of the web crawler can be effectively improved, so as to better realize the collection and analysis of data.