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What is a crawler?

Apr 28, 2019 pm 05:00 PM
reptile

Web crawlers, also known as web spiders and web robots, are more commonly known as web chasers in the FOAF community. They are a program that automatically captures World Wide Web information according to certain rules or Scripts, other less commonly used names include ants, autoindexers, emulators or worms.

What is a crawler?

Most crawlers follow the process of "send a request - get the page - parse the page - extract and store the content". This is actually It also simulates the process of using a browser to obtain web page information.

To put it simply, a crawler is a detection machine. Its basic operation is to simulate human behavior and go to various websites, click buttons, check data, or memorize the information you see. Like a bug crawling tirelessly around a building.

You can simply imagine: every crawler is your "clone". Just like Sun Wukong plucked out a bunch of hairs and blew out a bunch of monkeys.

The Baidu we use every day actually uses this kind of crawler technology: it releases countless crawlers to various websites every day, grabs their information, and then puts on light makeup and queues up to wait for you to retrieve it.

Related recommendations: "What is a python crawler? Why is python called a crawler?"

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