Advanced XPath Usage: Pinpointing Web Element Text

Don't use the stupid way! XPath + Proxy IP accurate catch data of the wild way!

engage in data capture brothers understand, the most headache is the webpage to change a structure positioning on the failure. Today we nag a little combat dry goods, teach you how to use the XPath of the tawdry operation with the proxy IP steady and accurate to grab the data, especially with ipipgo's unique skills, definitely let you go less than three years of curved road.

XPath positioning must kill three

Newbies love to copy XPath directly from the browser, which is fine for simple pages. When it comes to dynamic loading, nested elements, you have to play a little trick:

1. The fuzzy matching method://div[contains(@class,'price')] This is better than fixing the class name, and it catches whatever the web page is doing to change the style.

2. Sibling selection://h1/following-sibling::p specializes in unspecified neighboring elements, and is ten times more flexible than using absolute paths.

3. Multi-positioning of insurance://button[@id='submit' and text()='log in'] matches more than one attribute at a time, like double safing the element

Proxy IP Anti-Blocking Manual

What's the biggest fear of using XPath to capture data is that the IP will be blocked! This time we have to rely on ipipgo's dynamic residential proxy, to say a few real-life scenarios:

Focus on the unique configuration of ipipgo: their API return format can be directly stuffed into the requests, even the code does not have to change. Take a chestnut:

proxies = {
'http': 'http://用户名:密码@gateway.ipipgo.com:端口',
'https': 'http://用户名:密码@gateway.ipipgo.com:端口'
}

With this, your crawler immediately transformed into a thousand-faced Buddha, the site simply can not feel the set.

First Aid Kit for High Frequency Pitfalls

Q: What should I do if XPath positioning always fails?
A: eighty percent of the absolute path, hurry to change into a relative path + attribute combination. If you can't, you can go to ipipgo.Precision Positioning ModeTheir IPs can simulate real user visits and reduce anti-climbing interference.

Q: What should I do if my proxy IP is so slow that I cry?
A: Don't use free proxies! ipipgo's unique!Intelligent Routing TechnologyThe fastest nodes are automatically matched with the fastest nodes. Measured more than 3 times faster than ordinary agents, the key also supports pay-per-use.

Q: What can I do if I encounter human verification?
A: Residential proxy + request interval randomization is the way to go. ipipgo'sReal-life behavioral simulation IP poolThe XPath function can be used in conjunction with XPath's text() function to basically bypass the 90% validation.

Veteran Driver Configuration Program

Finally dump a private configuration for high-frequency capture scenarios:

1. Using XPath's string () function to handle multi-level text
2. Setting random request intervals of 2-5 seconds
3. Automatic switching of ipipgo's residential IP every 20 requests
4. 3 automatic retries for exceptions, failures to alternate IP pools

With this combination of punches, it's not a dream to collect millions of data per day. Especially ipipgo'sIP Survival Detection FunctionIt's a lot less time-consuming than manual maintenance, as it automatically filters invalid proxies.

In the data business, choosing the right tool is twice the result with half the effort. Instead of tossing those fancy techniques, why don't you get a solid IP infrastructure first? Remember, a stable proxy IP is the key to data freedom.