Python Web Server: Python Proxy Web Server

A proxy web server in the end can do what?

When many people first hear about Python proxy servers, they are confused: what's the difference between this thing and a regular server? For example, if you have a courier station in front of your house (a normal server), a proxy server is like an intelligent sorting robot in the station. It can help you:

• Automatic switching between different courier lockers (IP addresses) for pickups
• Avoid couriers always knocking on your door (hide real address)
• Handle multiple requests to send and receive packages at the same time (concurrent requests)

搞爬虫的老张就碰到过坑：用自己电脑目标网站，结果IP被封得死死的。后来用ipipgo的代理IP池，就像给爬虫装上了The Mask of a Thousand ChangesThe efficiency of acquisition is directly doubled.

Second, hand to teach you to build a simple version

Let's get real and write a basic proxy server in Flask. Don't panic, the code is simpler than scrambled eggs:

from flask import Flask, request
import requests

app = Flask(__name__)

@app.route('/proxy/')
def proxy(url).
     This is replaced with the proxy provided by ipipgo
    proxies = {
        'http': 'http://user:pass@gateway.ipipgo.com:9020',
        'https': 'http://user:pass@gateway.ipipgo.com:9020'
    }
    resp = requests.get(url, proxies=proxies)
    return resp.content

if __name__ == '__main__'.
    app.run(port=8080)

After the run, visithttp://localhost:8080/proxy/https://目标网站.comThen you can go to the proxy. Note that you have to replace the user and pass with your own account registered on the ipipgo website, their proxy channel is as stable as an old bull pulling a cart.

Third, I've stepped over these potholes for you

The top three common mistakes newbies make, take a small notebook and memorize them:

IV. Essential tips for senior players

Want to get fancy? Try these tawdry maneuvers:

• IP pool dynamic management: like shuffling randomly switch ipipgo's IP, it is recommended to change every 5-10 requests
• Traffic camouflage: putting realistic browser fingerprints on request headers
• Failure retry mechanism: automatically cut the backup IP in case of blocking, ipipgo's API can get new IP in real time.

To cite a real case: an e-commerce company's price comparison system, after using these techniques, the success rate of data collection soared from 48% to 93%, and the operation and maintenance brother no longer need to get up in the middle of the night to deal with alarms.

V. Question-and-answer session

Q: Will it be expensive to proxy IPs?
A: ipipgo new users 9.9 can buy 500M traffic, enough to run a small project. The enterprise version supports pay-per-use, how much to use how much to count

Q: What is the difference between HTTP and SOCKS5 proxy?
A: Simply put, HTTP proxy is like a car that can only go on the highway, and SOCKS5 is like an off-road vehicle that can run on the mountain road. ipipgo supports both, according to the business needs of the selected

Q: How to prevent IP leakage?
A: Three tips: 1. use ipipgo's high anonymity proxy 2. regularly check if the IP is exposed 3. double encrypted channel on important business

A final word of caution: choose a proxy service provider by looking at the(med.) recovery raterespond in singingresponsivenessDon't just compare prices. Like ipipgo this kind of veteran manufacturers, although the price is not the lowest, but wins in the stable and reliable. There are back to my side of the three o'clock in the morning out of the problem, their technical customer service actually 10 minutes on the response, this after-sales is really conscience.