IP Proxy Server Capture

When doing web crawling, we often need to use proxy IPs to prevent IP blocking by target websites or to improve access speed. And how to get these proxy IP? This requires the use of IP proxy servers for crawling.

There are many powerful libraries in Python that can be used to implement IP proxy server crawling, such as requests, urllib and so on. We can use these libraries to request the source code of a proxy IP website and then extract the proxy IP information we need from it.

"`ipipgothon
import requests
from bs4 import BeautifulSoup

url = 'http://www.example.com/proxy'
headers = {
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/ 58.0.3029.110 Safari/537.3'
}

res = requests.get(url, headers=headers)
soup = BeautifulSoup(res.text, 'html.parser')
proxies = []
for item in soup.find_all('tr')::
ip = item.find_all('td')[0].text
port = item.find_all('td')[1].text
protocol = item.find_all('td')[4].text
proxies.append({
'ip': ip,
'port': port,
'protocol': protocol
})
“`

The above is a simple example of IP proxy server crawling with Python. Of course, this is only one of the methods, the actual may involve more complex web page structure and anti-crawl measures, need to be adjusted and processed according to the specific circumstances.

Proxy IP extraction website source code

Usually, websites that can provide free proxy IPs will display some proxy IP addresses and ports on their web pages, and we can get this proxy IP information by extracting the website source code. Using a library like BeautifulSoup in Python can easily accomplish this step.

In addition, some proxy IP websites will hide the proxy IP information in dynamically loaded content such as JS, which requires the use of tools such as Selenium to simulate browser behavior for crawling. Of course, you can also analyze the website's API interface to directly obtain the proxy IP data.

Overall, proxy IP extraction needs to be handled accordingly depending on the specifics of the website. Understanding the structure of the webpage and the way of dynamic loading, and analyzing the source code of the webpage are the keys to get the proxy IP. In the process of using proxy IP, you also need to pay attention to the stability and availability of the proxy IP, to avoid the use of invalid proxy IP leading to access failure.

The above is some brief introduction about IP proxy server crawling and proxy IP extraction website source code, hope it will be helpful to you.