Web Crawler: Automated Collection System Architecture

First, why is the crawler always with the IP?

Engaged in data collection know that the crawler program is like a hard-working bee, 24 hours non-stop honey. But the site is not vegetarian, caught frequent visits to the IP on the seal, light 403 warning, heavy permanent black. Last year, an e-commerce price comparison team, with a fixed IP to capture data, the results of the next day, the entire IP section of the server room were blocked, the loss of tens of thousands of dollars.

There's a lot of doors here:
1. Excessive frequency of visits: dozens of requests per second from the same IP, a fool can tell it's a machine!
2. Abnormal behavioral characteristics: no browser fingerprinting, no mouse movement simulation
3. IP pool too small: Using just those few IPs back and forth is more conspicuous than a tick on the head of a bald man.

Second, the wonderful use of proxy IP

This time we have to move out of our savior - proxy IP. it is like giving the crawler to wear a cloak of invisibility, every time you visit a different armor. Take ipipgo's service as an example, their dynamic residential IP pool has three great skills:

III. System architecture design points

When you're working on an automated acquisition system, you've got to get these modules straightened out:

 Pseudo code example
def maincrawler(): while True: while True: while True: while True
    while True: ip = ipipgo.get_proxy()
        ip = ipipgo.get_proxy() get fresh IP from ipipgo
        data = send request(ip)
        Process data()
        Store database()

def Exception Handling().
    try.
        Main Crawler()
    except blocked exception.
        Blackout current IP
        Retry with new IP

Focus on the agent management module::
1. ping test IP availability before each request
2. Set the number of failed retries (recommended 3)
3. Different websites with different IP pools to avoid the string of flavor

Fourth, how to pick a reliable agent service

The market agent services are mixed, remember these three points to avoid the pit guide:
- Look at the IP type: prefer dynamic residential IPs (e.g., ipipgo's library of live residential IPs)
- Measurement of response speed: the average delay should be <1.5 seconds
- Check the success rate: below 90% direct pass

Previously used an unknown service provider, said million IP pool, the result is that 8 out of 10 are waste. Later, I switched to ipipgo, who has aunique secret-IP quality real-time monitoring system, automatic elimination of failed nodes, this point is really save.

V. QA Frequently Asked Questions

Q: What should I do if my proxy IP is slow?
A: ①check the local network ②change the low latency area ③contact ipipgo technical support tuning

Q: How do I break the CAPTCHA when I encounter it?
A: ① Reduce the frequency of requests ② with UA camouflage ③ with ipipgo's high stash of proxies

Q: How do I test if the proxy is working?
A: Visit http://ipipgo.com/checkip to see if the display IP changes

Sixth, say something heartfelt

In the crawler business, the proxy IP is the lifeblood. Choose the right service provider can save 80% trouble, ipipgo has a hidden benefit - new users to send 5G flow trial, enough to measure the depth. Their technical support is also quite real, the last midnight two o'clock to mention the work order, actually 10 minutes someone to reply.

Lastly, don't use free proxies for cheap, those IPs have been marked as sieves by major websites. Professional things to professional people, spend a little money to buy a stable service, always better than the data collection interruption, do you think this is the reason?