Python Modular Development: Python Agent Module Integration Tutorial

What's the point of Python agent module integration anyway?

We do crawl friends understand that sometimes the website anti-pickpocket mechanism is too hard, often blocked IP, this time the proxy module is like a program installed a "cloak of invisibility", so that the request is sent from a different IP address. To give a chestnut, crawling e-commerce price data, with a proxy IP can effectively avoid being the target site black.

Here's where to draw the line:The core value of the agent module is to enhance the continuous operation of the programThe project needs to collect data stably for a long period of time. Especially for projects that require long-term and stable data collection, not having an agent module is like running a long distance in a car without brakes, sooner or later it will turn over.

Choosing the type of agent is more important than choosing the target

There are a variety of types of proxies on the market, we use Python to do development is mainly concerned about three points: protocol support, IP purity, connection stability. Here the common types organized into a table more intuitive:

Personally, I recommend using ipipgo's dynamic residential proxy, his IP pool is ridiculously large, and the real test ran continuously for 24 hours without a CAPTCHA. In particular, theirTK LineIn the specific business scenario, the response speed can be as fast as 30% or so.

Hands on integration of ipipgo proxies

Take the requests library as an example of a three-step integration agent:

import requests

 Proxy information from ipipgo
proxy = {
    'http': 'http://user:pass@gateway.ipipgo.com:9020',
    'https': 'http://user:pass@gateway.ipipgo.com:9020'
}

try.
    response = requests.get('https://目标网站.com',
                          proxies=proxy, timeout=10)
                          timeout=10)
    print(response.text)
except Exception as e.
    print(f "The request went wrong: {str(e)}")

Pay attention to two pitfalls: 1. account password if there are special characters remember the URL code 2. timeout time is recommended to be set at 8-15 seconds, depending on the target site response speed.

Practical Case: Distributed Crawler Architecture

For scenarios that require multi-threading/multi-processing, it is recommended to use the proxy middleware pattern. Here's a pseudo-code idea:

class ProxyMiddleware.
    def __init__(self).
        self.proxy_pool = self.load_proxies()

    def load_proxies(self).
         Call ipipgo API to get the latest proxy list.
         It is recommended to get 50-100 IPs at a time
        pass

    def get_proxy(self).
         Implement proxy rotation logic
         It is recommended to automatically eliminate invalid proxies based on the response status code.
        return random.choice(self.proxy_pool)

Here's the kicker.Proxy Health ScreeningThis section. It is recommended to run a detection script every half hour to mark as invalid any proxy whose response times out or returns an abnormal status code. ipipgo's API supports getting available proxies in real time, which is especially friendly for long-term projects.

Frequently Asked Questions QA

Q: What should I do if the proxy fails frequently?
A: It is recommended to use ipipgo's exclusive static IP package, each IP has a dedicated maintenance. If it is a dynamic IP, remember to set the automatic replacement frequency, don't let an IP use too long.

Q: Can't connect to the HTTPS website?
A: Check if the proxy protocol supports https, ipipgo's proxy supports full protocol by default. If it doesn't work, try adding verify=False parameter in the code (but it will affect the security).

Q: How can I tell if a proxy is in effect?
A: The simple way is to use the httpbin.org/ip interface to test and see if the returned IP changes. The advanced approach is to record the exit IP of each request and create a usage log.

The Doorway to Choosing a Package

Choose based on business needs:
- Dynamic Standard for test phase ($7.67/GB)
- Enterprise Edition Dynamic for Enterprise Projects ($9.47/GB)
- Choose static residence if you need fixed IP ($35/IP)
Highlight:Dynamic packages are billed by traffic, static packages are billed by number of IPsDon't waste your budget by choosing the wrong type.

Last but not least, ipipgo has a ready-made SDK in its developer documentation, which saves a lot of time compared to writing your own wheels. Their technical support response is also fast, the last time I encountered a socks5 proxy weird problem, the engineer in 10 minutes to solve it.