Multi-threaded Crawler Proxy IP Control: Stability Optimization under Concurrent Requests

How do multi-threaded crawlers keep getting blocked? Try the proxy IP solution

Brothers engaged in crawling should have encountered this hurdle - obviously the code is written smoothly, the results of a concurrent on the crazy error. Either the IP is the target site black, or the response rate fell off a cliff. At this time you have to move out the proxy IP this savior, especially like theipipgo Dynamic Residential ProxyThis can automatically change IPs, it is simply the renewal of multi-threaded crawlers.

Which one should I choose, dynamic or static proxy?

First of all, let's break down two concepts: dynamic proxy IPs are like mobile vendors who may change to a new IP every time they request a new one, and static proxy IPs are more like fixed stores who use the same IP for a long time. let's use a table to compare them in a more intuitive way:

To give a real case: to do e-commerce price monitoring, use theipipgo Dynamic Residential EnterpriseIt's most suitable, their IP pool has more than 90 million real residential IPs, not afraid of being blocked at all. If you do business that requires login status, such as social media operations, then you have to use static proxies to keep the session alive.

Three life-saving settings for concurrent requests

1. token bucket control method: Don't be stupid and open 100 threads hard, use a token bucket algorithm to control concurrency. For example, release up to 50 requests per second, and queue up anything over that.

from threading import Semaphore
import time

class RequestLimiter.
    def __init__(self, max_requests).
        self.semaphore = Semaphore(max_requests).

    def make_request(self, url): with self.semaphore: with self.semaphore: with self.url
        with self.semaphore.
             Replace the proxy settings here with ipipgo's proxy settings
            proxies = {"http": "http://user:pass@gateway.ipipgo.com:8080"}
            return requests.get(url, proxies=proxies)

2. Intelligent Delay MechanismDon't use a fixed SLEEP time, dynamically adjust it according to the response status. For example, if 3 consecutive requests are successful, the delay will be reduced by 10%, and the waiting time will be automatically doubled if a 429 error is encountered.

3. Connection Pool Reuse: Frequent switching of connections is particularly resource-intensive. It is recommended to userequests.Session()In conjunction with connection pooling, set up the SOCKS5 proxy for ipipgo like this:

session = requests.Session()
session.proxies.update({
    'http': 'socks5://user:pass@static.ipipgo.com:1080',
    'https': 'socks5://user:pass@static.ipipgo.com:1080'
})

A guide to avoiding pitfalls in the real world

- IP Quality Inspection: Every time you get a new IP first send a test request, recommend using ipipgo'sIP Survival Detection InterfaceThe IP address of the IP address is the IP address of the current IP address, and the IP address of the current IP address is the IP address of the current IP address.

- Failure to Retry Strategy: Don't just give up when the connection times out, we recommend retrying 3 times with the exponential backoff algorithm. Note that you have to change IP and User-Agent at the same time.

- Traffic balancing solutionsDon't glean the IP of a region, use ipipgo'sCity-level positioningFunction to rotate exit IPs for different geographic locations

Frequently Asked Questions QA

Q: What should I do if all the proxy IPs suddenly fail?
A: Check whether the account balance is sufficient, if it is ipipgo user can pass the console of theReal-time usage monitoringCheck IP pool status and switch alternate authentication methods if necessary

Q: How do I verify if the agent is in effect?
A: Add IP detection logic in the code, recommended to use httpbin.org/ip interface, the returned origin field should show the proxy IP instead of the local IP

Q: What package should I choose for my enterprise level project?
A: Average daily requests over 500,000 are recommended to use theipipgo Dynamic Residential EnterpriseSupport customized IP retention time and exclusive channel, more than 40% stability than the standard version.

Some solid selection advice

For those of you who are just starting out as crawlers, go straight to theipipgo Dynamic Residential Standard EditionIt's just fine, and it doesn't hurt to be billed by traffic. When the business volume comes up, especially the need to deal with CAPTCHA recognition, high-frequency acquisition of these hardcore, and then upgraded to the enterprise version of the package. Remember, proxy IP is not a panacea, with the request header camouflage, device fingerprint simulation of these means in order to maximize the effect.

Finally, a reminder: do not try to cheap with a free agent, those IP are basically ten thousand people have ridden, slow not to say that it is also easy to be anti-climbing system marking. Like ipipgo this regular service providers haveIP purity test report, use it to get down to business.