How Does Google Crawl Web Pages? Unveiling the Whole Process of Google Spiders Crawling a Website
Many people don't understand. There are so many identical web pages. How does Google actually distinguish which article to crawl first? The content is the same, so why does another website get crawled while theirs doesn't? Now let's unveil the whole process of Google spiders crawling a website. Friends in need can refer to it.
The working process of a search engine is very complex. Today, I'll share with you what I know about how Google spiders achieve web page crawling.
The work of a search engine can be roughly divided into four processes:
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Spider crawling and crawling.
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Establishing a keyword index for web pages.
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Outputting results for user searches.
Spider Crawling and Crawling
When a Google spider arrives at a page, it will follow the links on the page and crawl from this page to the next page, just like a recursive process. It works tirelessly year after year. For example, when the spider comes to the homepage of my blog http://blog.dsdfdsf.com.cn/netSEOer, it will first read the robots.txt file in the root directory. If the search engine is not prohibited from crawling, the spider will then start to track and crawl the links on the page one by one. For example, for my pinned article "SEO Overview | What is SEO and What Exactly Does SEO Do", the engine will come to the web page where this article is located in a multi - process way to crawl information. This cycle continues without end.
To avoid repeatedly crawling and crawling URLs, the search engine has a database that records crawled and uncrawled addresses. If you have a new website, you can submit the website's URL to Google's official website. The engine will record it and classify it as an uncrawled URL. Then the spider will extract the URL from the database according to this table, visit and crawl the page.
The spider will not crawl all pages. It has to go through strict detection. When the spider is crawling and crawling the content of a web page, it will conduct a certain degree of duplicate content detection. If the website where the web page is located has a low weight and most of the articles are plagiarized, the spider may not like your website, stop crawling, and thus not crawl your website.
Establishing a Keyword Index for Web Pages
After the spider crawls a page, it will first analyze the text content of the page. Through word - segmentation technology, the content of the web page is simplified to keywords, and a table is made with the keywords and the corresponding URLs to establish an index.
There are forward indexes and reverse indexes. The forward index is the keywords corresponding to the web page content, and the reverse is the web page information corresponding to the keywords.
When a user searches for a certain keyword, the keyword matching is carried out through the index table established earlier. The page corresponding to the keyword is found through the reverse index table. After the engine calculates the comprehensive score of the web page, the ranking order of the web pages is determined according to the scores of the web pages.
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