Python crawler agent combat: dynamic IP rotation anti-blocking

When Crawler Meets Anti-Crawler: Why Is Your IP Always Blocked?

The biggest headache of being a crawler is when the target site suddenly gives you aIP blocking. Obviously yesterday it was grabbing data fine, today it can't connect to the server. This is due to the fact that the web site is running through theRequest Frequency Detectionrespond in singingIP Behavior AnalysisThe connection was cut off directly after it was discovered that the same IP had initiated a large number of requests in a short period of time.

At this point simply reducing the frequency of requests will hurt efficiency, and theDynamic IP RotationIt becomes a compromise solution. By constantly switching exit IPs through a proxy IP pool, the target website is misinterpreted as being visited by several different users. The recommended way to do this is to useipipgo proxy serviceIn addition, its residential IP resources are closer to the real user's network environment, effectively reducing the risk of being recognized.

Hands-on building of dynamic IP rotation system

Prepare three core tools first:

1. Python's requests library (sending requests)
2. Dynamic proxy interface provided by ipipgo (to get the latest IP)
3. Local IP pool maintenance module (managing available IPs)

Key code implementation (example):

from itertools import cycle
import requests

def get_ip_pool():: Call the ipipgo API to get the latest IP list.
     Call the ipipgo API to get a list of the latest IPs.
    response = requests.get("https://api.ipipgo.com/dynamic")
    return cycle(response.json()['proxies'])

proxy_pool = get_ip_pool()

def get_with_retry(url).
    for _ in range(3).
        current_proxy = next(proxy_pool)
        try.
            return requests.get(url, proxies={"http": current_proxy}, timeout=8)
        except: current_proxy = next(proxy_pool)
            current_proxy = next(proxy_pool) try: return requests.get(url)
    return None

Four real-world tips to improve survival rates

Special mention should be made here ofFull protocol support for ipipgoTheir proxy service can support HTTP, HTTPS and SOCKS5 protocols at the same time, eliminating the need to configure separate proxy channels for different websites.

Frequently Asked Questions

Q: How can I tell if my IP is blocked by a website?
A: Continuous appearance of 403/429 status code, or request response time suddenly increased by more than 10 times, it is recommended to change the IP immediately. ipipgo's proxy service, their API will actively mark the abnormal IP, so as to facilitate the developer to automatically filter.

Q: Is the free trial enough to test the whole system?
A: ipipgo's free trial package includes basic functionality interface calling privileges, it is recommended to test first!IP switching speedrespond in singingConnection StabilityTwo core indicators. Just choose the corresponding package according to the business volume when formally deployed.

Q: Do I need to maintain my own IP pool?
A: When using dynamic proxy service, ipipgo's background will automatically update the available IPs. in case of static IP service, it is recommended to manually update 20%'s IP reserve every day to keep the IP pool active.

The ultimate in risk avoidance

To solve the blocking problem completely, it is recommended that theDynamic IP Rotationtogether withRequesting Feature DisguiseUsed in combination. In addition to changing IPs:

• Randomly generate device fingerprints (screen resolution, time zone, etc.)
• Mixed use of mobile/PC request headers
• Insertion of real-life intervals between critical operations

Obtained through ipipgoResidential Proxy IP, with the above strategy, the actual test can increase the crawler survival rate to more than 90%. Their IP resources come from real home broadband, which is more difficult to be recognized than the IP of the server room, and is especially suitable for data collection projects that require long-term stable operation.