How to use proxy ip for crawlers

Proxy IP crawler, you may still sound a little strange, but do not worry, I'll give you a popularization, so that you have a comprehensive understanding of this concept. In the future, you can be like a god, easy to play proxy IP crawler!

Getting to know proxy IP crawlers

In our daily use of the Internet, we often encounter some restrictions and obstacles. For example, you want to visit a certain website, but you are told that it is not accessible in your region; or you frequently request a website and it is blocked. This is when proxy IP crawlers can help you out.

What is a proxy IP? Simply put, a proxy IP is a relay station provided to you by someone else, through which your request is forwarded, and the target website can only see the IP address of the relay station, not your real IP address. In this way, you can bypass the blocking or restriction and swim in the Internet.

Principle of Proxy IP Crawler

Since proxy IP is so useful, how to get it? That's where Proxy IP Crawler comes in! Proxy IP crawlers can automatically crawl, verify and store a large number of proxy IPs from various sources for our use.

Specifically, the proxy IP crawler has these steps:

1. Crawling proxy IP sites: Crawlers simulate browser behavior to visit proxy IP sites and obtain web content. These proxy IP sites usually provide a large number of free proxy IPs.

2. Extract proxy IP information: The crawler will extract proxy IP related information from the web page, such as IP address, port number, protocol type, etc.. This information will be organized into structured data for our subsequent use.

3. Verify the availability of proxy IPs: Since the quality of free proxy IPs varies, we need to verify the availability of the proxy IPs we get. The crawler will send a request to check whether the proxy IP can connect to the target website normally.

4. Storing Proxy IPs: Proxy IPs that pass the authentication are stored in a database or other storage medium for us to retrieve when we use them.

Proxy IP Crawler Implementation

Then how to specifically implement a proxy IP crawler? Below I give you a Python based sample code.

import requests
from bs4 import BeautifulSoup

# Step 1: Crawl Proxy IP Sites
def crawl_proxy_ip(): url = ''
url = 'http://www.shenlongip.com/nn/'
headers = {
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0;Win64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3'
}
response = requests.get(url, headers=headers)
soup = BeautifulSoup(response.text, 'html.parser')
proxy_ips = soup.select('#ip_list tr')

for proxy_ip in proxy_ips.
ip = proxy_ip.select('td')[1].text
port = proxy_ip.select('td')[2].text
protocol = proxy_ip.select('td')[5].text
print(f'Crawling to proxy IP: {protocol}://{ip}:{port}')

# Step 2: Extract Proxy IP Information

# Step 3: Verify Proxy IP Availability

# Step 4: Storing Proxy IPs

if __name__ == '__main__'.
crawl_proxy_ip()

Crawling data using proxy IPs

Through the above steps, we have successfully crawled the proxy IP, and verified and stored. Then, we can use these proxy IPs to crawl the data we need!

In the use of proxy IP crawl data, we only need to initiate the request, specify the use of proxy IP can be. The specific sample code is as follows:

import requests

def crawl_with_proxy(): target_url = ''
target_url = 'https://www.example.com'
proxy_ip = '127.0.0.1' # Assuming this is a captured proxy IP

proxies = {

'https': 'https://' + proxy_ip
}

response = requests.get(target_url, proxies=proxies)
print(response.text)

if __name__ == '__main__'.
crawl_with_proxy()

In this way, we can crawl the data of the target website using proxy IP without any problem.

put at the end

Through the introduction of the above sections, I believe you have a preliminary understanding of proxy IP crawler. Proxy IP crawler can help us get a large number of available proxy IPs, so that we can swim in the Internet more freely and crawl the data we need.

Of course, the implementation of proxy IP crawler is much more than that, there are more technical details and optimization solutions waiting for us to explore in depth. I hope that today's popular science can open a new world for you, so that you can better utilize the proxy IP crawler to discover more interesting and useful information. Go for it, Junior! You can definitely become a master of playing around with proxy IP crawlers!