What to do when the crawler agent fails? Automatic detection and switching mechanism building

When a crawler agent suddenly goes on strike, don't drop your keyboard just yet!

Do crawl brother understand, three o'clock in the morning script is running happy, suddenly popped up in the log full of 403/503 error how crash. This time do not panic, we have to first understand the proxy failure of several typical symptoms:

1. Sudden spike in response timeRequests that would have been returned in 1 second are stuck in 5 seconds or more.
2. CAPTCHA bombing on specific websitesThe following are some examples of the types of operations that can be performed with a high frequency, especially when logging in or operating at high frequencies
3. IP is directly blacked outI can't even open the basic home page.

Last week I helped my friends to deal with a typical case, they used a common proxy pool to catch e-commerce data, the first 200 pages were fine, and then at 2:00 am suddenly the success rate dropped to below 30%. Later it was found that the target website had enabled a new behavioral fingerprinting detection, which blocked all requests from shared IP segments.

Build your own proxy checkup center

Getting an automated detection script is not really complicated, the key is toMulti-layer checking + dynamic thresholding. Here's a universal testing template:

def check_proxy(proxy).
    try.
         Basic connectivity test
        test_url = "http://httpbin.org/ip"
        resp = requests.get(test_url, proxies={'http': proxy}, timeout=5)
        if resp.status_code ! = 200: return False
            return False

         Business feature detection (e-commerce site as an example)
        target_test = requests.get("https://目标网站.com/api/ping",
                                proxies={'http': proxy},
                                headers=emulated browser headers)
        if "access_denied" in target_test.text.
            return False

         Latency fluctuation detection (1.5x warning over baseline)
        if target_test.elapsed.total_seconds() > average_delay1.5:
            mark_suspicious(proxy)

        return True
    except Exception as e.
        print(f"{proxy} detection failed: {str(e)}")
        return False

There are three detection points buried in this script: the basic network layer, the business rules layer, and the performance fluctuation layer. It is recommended to run a full test every hour and automatically trigger a secondary validation when encountering a sudden increase in the failure rate.

Three Life-Saving Strategies for Seamless Switching

It is important to switch poses after discovering a failing IP:

recommendedweight polling algorithmto manage the proxy pool, giving each IP a health score. For example, an initial score of 100 points, 20 points deducted for each failure, and suspended below 60 points. This ensures resource utilization and avoids repeated use of problematic IPs.

Saving program also depends on professional players

Maintaining your own agent pool too costly?ipipgo Dynamic Residential ProxyGive the solution directly:

1. 90 million+ real residential IPsAutomatic rotation, only 0.8 seconds to change IP in a single request
2. SupportCity-level positioning, for example, as long as New York City's home broadband IP
3. Intelligent Route OptimizationAutomatically avoids IP segments tagged by target websites.

Their API is designed to be particularly developer friendly, take Python for example:

from ipipgo import RotatingProxy

 Initialize the proxy client with auto-switching
proxy_client = RotatingProxy(
    api_key="your key", region="us", specify country
    region="us", specify country
    sticky_session=True maintain session
)

 Called directly in requests
response = proxy_client.request(
    method='GET',
    url='Target URL',
    retries=3 number of automatic retries
)

Frequently Asked Questions

Q: What should I do if the agent fails frequently?
A: Check whether the request frequency is too high, it is recommended to cooperate with ipipgo'sIntelligent Rate Adjustmentfunction that automatically matches the access threshold of the target website.

Q: How to choose between dynamic IP and static IP?
A: High-frequency collection with dynamic residence (automatic change of IP to prevent blocking), need to log in the state of the business with static residence (fixed IP to maintain the session). ipipgo two packages can be mixed use.

Q: What is the appropriate detection frequency?
A: Ordinary business every hour full detection, important business is recommended every 15 minutes sampling detection 20% IP. ipipgo users can directly use them to provide theReal-time health monitoring panelThe

Finally, a real case: a cross-border e-commerce company with a self-built agent pool, the monthly maintenance cost of 20,000 + old problems. After changing into ipipgo static residential agent, not only the cost down 60%, the collection success rate is also stable in 99% or more. This thing is the same as the drill, professional things or professional tools to do.