VBA Crawl Site: Excel Automated Capture Tutorials

VBA web crawler always stuck? Try this proxy IP trick

Recently, a lot of friends doing e-commerce to find my groan, said that the use of Excel to capture the price of competitors is always off the chain. Either the data capture is incomplete, or the IP is directly blocked, tossing half a day in the table is still empty. Today, we will teach you how to useVBA + Proxy IPThe combinations that make data collection steady as an old dog.

Why does your VBA always get pulled from websites?

Many newbies do not know, now the site are installed "electronic gatekeeper". For example, a treasure anti-climbing system, received 30 requests within 1 minute, directly blocked IP. I have seen the most ruthless case, a buddy with their own broadband to capture data, the results of the entire company network have been blacklisted.

How do proxy IPs renew VBA?

And here's where our savior comes in--ipipgo dynamic proxy serviceThe first time I saw it, it was like changing a million vests for Excel. It is like changing countless vests for Excel, and changing a new IP for each request. testing with his residential proxy, continuous collection for 8 hours did not trigger the protection mechanism.

Sub Crawler With Proxy()
    Dim http As Object
    Set http = CreateObject("MSXML2.XMLHTTP")

    ' Get the latest proxy from ipipgo (fill in your own API here)
    proxy = GetIPFrom_ipipgo() ' return format 1.2.3.4:8080

    http.Open "GET", "https://目标网站.com", False
    http.setProxy 2, proxy ' set proxy mode
    http.send

    ' Process the returned data...
End Sub

Hands-on Configuration of Agents in 3 Steps

Step one:Go to the ipipgo website and register, then select theDynamic Residential AgentsPackages, don't choose the data center IP for cheap, that's easy to be detected.

Step two:Add the Proxy Authentication header to the VBA, this is something many people will miss:

http.setRequestHeader "Proxy-Authorization", "Basic " & Base64 encoding("Account:Password")

Step Three:Remember to set a random delay, don't send requests like a machine gun, it's recommended to randomly pause between 200-800 milliseconds

A practical guide to avoiding the pit

I stepped on these mines last week while helping a client with a drug comparison system:

1. SSL certificate issue: add at the beginning of the codehttp.setOption(2) = 13056bypass verification
2. IP pool reuse: be sure to detect the return content, found the verification code immediately switch to a new IP
3. Timeout setting: recommended no more than 10 seconds, ipipgo's response speed is generally within 3 seconds

Frequently Asked Questions First Aid Kit

Q: How many times will the proxy IP be invalidated?
A: Check if you are using a shared IP pool, change to ipipgo's exclusive proxy package to solve the problem immediately!

Q: Can't get the crawl speed up?
A: open 5-10 asynchronous requests at the same time, with ipipgo's 5Gbps high-speed channel, the speed can be doubled by 8 times!

Q: HTTPS websites always report errors?
A: PutMSXML2.XMLHTTPexchange (sth) for (sth else)WinHttp.WinHttpRequest.5.1Try the object.

Why ipipgo?

We tested 7 providers at first and finally locked in on ipipgo for three reasons:
1. Genuine residential IP with full camouflage pull
2. Exclusive supportAutomatic User-Agent replacement
3. Customer service response within 10 minutes in case of technical problems
Last week they put on a newCity-level positioningFunctionality, superb when doing localized data collection

To be honest, engaging in automated capture is like fighting guerrilla warfare. The last time I used ipipgo's rotation strategy, I successfully bypassed a certain East's municipal IP blockade. Remember the key points:Quality Proxy + Randomized Delay + Exception Handling, these three axes go down, 90% site can be fixed.