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Could you imagine a spider crawling in your place? No, it is somewhat not accepted from common view but if we see from the view of a tech person then it may seem to be quite usual. For a webmaster, a web crawler is like a spider that he wants to visit his website. A web robot that peruses the World Wide Web systematically is known as a web crawler or sometimes more commonly as the spider. Web indexing for a page or a complete website is done with the help of the web crawlers. It thus helps the search engine in proper indexing of a page. Spidering or web crawling software is often by the search engines and other sites in order to update the content of their website or indices or web content of other websites. While crawling through a page the web crawlers generally make a copy of that page that they visited. This copy is used afterward by the search engine thus indexing the copied pages. This helps the users with a better and must faster search result. It collects all the information and the resources of the system that they visited and often sites are visited without any tacit approval. When the web crawler has to crawl a lot of pages then issues such as load, politeness, and schedule is also been noticed. There are mechanisms or files that can prevent the web crawlers or spiders from visiting a page. This mechanism tells the spider which pages to visit and which to not. Webmaster often uses these files in order to hide database or a page that is under process and he does not want that the web crawler crawl that page. Such a file is the robots.txt file that can specify the web crawlers which page to visit and which to not. Before the starting of the year 2000, the search engines were not capable of indexing some websites that have a number of extremely large pages. Some of the big crawlers were being used to crawl those pages but nothing came in actual use. In the year 2000, some search engines were invented that were capable of solving these issues and today large pages along with the smaller ones are being crawled in an easy manner and more efficiently. HTML code and hyperlinks are validated by the web crawlers. Another function of web crawler can be that of web scraping.
So, how the web crawlers crawl your page? Is there any policy for crawling? On what policies do they crawl? So, here is the answer. There are a number of policies on which the web crawler’s behavior is largely dependent. They can be briefly described as;
Truly speaking there is no security that while crawling a website there is no tension of data breach or compromise. Many times it has lead to data breach. Most of the webmasters do want that their website should be indexed properly in order to view high of their website in the search engine but at the same time, they do suffer from the tension of data breach or compromise. To avoid this condition, experts in the search engine do prescribe to have the robots.txt file in order to hide their valuable information present in the website.
This Web Crawler Simulator used in order to stimulate the search engine. It displays the search engine the web page contents exactly in the way that the search engine will see it while crawling the page. Thus it can be termed as a software application designed for the crawlers for the purpose of indexing the websites. There are a lot of search engine web crawler simulator available n the search pages. You need to enter the URL for which you are carrying the search and click on the submit button. In a second it will display result showing all the details of Meta content containing Meta Title, Description and Keywords details for that page. It also contains the H to H4 tags, Indexable links, readable text content, source code, recent posts on the SEO chat forums, recent posts on the Threadwatch.org and users comments. This software is very useful for the search engine indexing.