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one way to do this would be to allow users/community members to run the crawler on their machines and build the index on their machine and share the index to the mainsite .. saving the main site time it takes to crawl a site politely...

Is there a textbook where you are taking the screenshots from ?

Things to keep in mind: Visiting links can cause actions to be performed on websites, especially if you visit POST links (because some sites are programmed badly, I've heard of websites being wiped out by google crawlers because the "delete content" functions were accessible via GET request links, and without authentication). Wikipedia is completely "open": they provide resources/links to download their entire website via torrent (or directly) iirc it's about 70gb and you'll be able to construct the url for each page using the data they provide in xml format. As such, they ask developers to not crawl the website as it adds to their costs. And since they're one of the only truly free websites on the internet, you should look at how you can respect their wishes, or at least pause crawling their site until you've finished your project and you're ready to deploy.. The wikipedia xml data includes everything, even the discussion pages for each wiki page. The same may also be true for websites like stackoverflow. I understand that developing a way to parse data from downloads to include in your results will add a lot of work, but it's the right thing to do. It will reduce your costs, their costs, will process faster, and you're less likely to get blocked; so there are benefits. It's possible to visit websites you're not supposed to: I was looking for data on NASA's website, and they provided a link publicly that took me to a private website that was only supposed to be accessed by their employees. A large warning from the US govt came up saying that everything I do will be monitored and after reading it I left. A crawler won't be able to read and understand bespoke warnings like that.. Plus there are unscrupulous websites out there that you won't want to visit either, particularly ones that may be legal in your country but not in others. Some websites have circular links (with randomized urls) in order to trap crawlers. You won't catch a virus if you shake hands with one person, but if you shake hands with a million people, you're sure to catch something.. If you're running this from your home network, make sure you have a secure router (and a subnet). If you're running this from a VPS make sure you have hardened it.

Very interesting, I have always wondered how the big search engines handled all the link data. I will be watching your career with great interest.

Good job! I just learned about the project. I was seeking for an alternate search engine a few months ago, and this looks good!

cool

What is crawling?

Watch this video next! ruclips.net/user/shortsikYVNKh6OuI

Very cool