Craigslist Data Scraping Tool Development Tutorials

The most common pitfalls of Craigslist data crawling.

The brothers who have done web crawling know that Craigslist, an old classifieds site, is particularly fond of IP blocking, and last month I helped a friend to get used car data, and used my own server to grab more than 200, and suddenly returned a 403 error. What's more, the entire IP segment of the server room was blacked out, which made me squat in front of the computer and smoke half a pack of cigarettes before slowing down.

Later testing revealed three main features of Craigslist's blocking strategy:The speed of IP blocking is faster than the delivery of food by Meituan boys,Blocking the same IP segment together with a ban,Greater tolerance for residential IPThe first thing you need to do is to use a proxy IP. Normal server room IPs basically don't survive more than half an hour, which is why you have to use proxy IPs for cover.

Choosing a proxy IP is like looking for a partner, it depends on these three things.

There are tons of proxy providers on the market, but there really aren't many that are suitable for Craigslist crawling. Based on my experience of stepping through the pits, focus on these three metrics:

Here's a key boast about ipipgo's dynamic residential IPs, theirIP pool covers all 50 states in North AmericaI've been able to get real residential broadband IPs for every request, and once I purposely ran the capture program overnight, and the next morning I looked at the stats and saw that more than 300 IPs had been changed in 8 hours, but they weren't blocked.

Hands-on teaching you the whole live capture tool

In Python, for example, the core code is just five steps:

1. Go to the ipipgo backend to generate an API key (remember to select the North American residential IP)
2. Install the requests library:pip install requests
3. Configure the agent middleware:

import requests

def get_proxy(): { {proxy(): {proxy(): {proxy(): {proxy()
    return {
        
        'https': 'https://用户名:密码@gateway.ipipgo.com:端口'
    }

response = requests.get('https://craigslist.org', proxies=get_proxy())

4. Setting random request intervals (3-10 seconds recommended)
5. Fake User-Agent (remember to add Windows and Mac mobile UA)

Don't be lazy and skip step 4!!! I once set the interval to 1 second and the IP survival time for ipipgo dropped straight from 6 hours to 20 minutes. It is recommended to usetime.sleep(random.uniform(3,8))This randomized pause makes the visit seem more like a real-life operation.

Anti-Blocking Tips Summarized by Old Drivers

According to the experience of these two years of helping customers catch data, these three tawdry operations can significantly reduce the probability of being blocked:

• Mixed use of ipipgo'sdynamic IPrespond in singingLong-lasting static IPStatic IP for important data to ensure stability
• The UA library is updated every Tuesday afternoon (US time), a time when Craigslist's blocking tactics are briefly relaxed
• Don't be hard on CAPTCHA, accessing a coding platform saves more effort than building your own recognition model.

Frequently Asked Questions QA

Q: Why do I still get blocked even if I use a proxy IP?
A: 80% of the IP purity is not enough, it is recommended to change ipipgo's residential IP. do not be greedy to use free proxy, those IPs have long been Craigslist in a small book.

Q: How much IP volume is needed per day to be sufficient?
A: Based on 50 requests per hour, it's safer to prepare a pool of 200 IPs/day. ipipgo's packages includeBasic package for 500 IP daily shiftsIt's good enough for small to medium sized projects.

Q: Is data scraping legal?
A: As long as it does not involve user privacy, to comply with robots.txt rules will be fine. It is recommended not to touch the phone number and e-mail these sensitive information, we only grab the public product data!

Lastly, I'd like to say a few words from the bottom of my heart, doing data capture is a cat and mouse game in this business. Last year, I used seven or eight agent service providers, the last long-term cooperation or ipipgo. their technical customer service once at two o'clock in the morning to help me debug the request header, this kind of service in the industry is really not common. Recently, the official website is engaged in new users to send 5G flow activities, want to enter the pit brother can go to woolgathering try.