Wecrawler

Wecrawler
From Wikipedia, the free encyclopedia
This article is about the search engine . For web crawling programs in general, see web crawler .

^ Jump up to: a b "Short History of Early Search Engines" . The History of SEO . Retrieved 2019-02-03 .

^ Jump up to: a b c d e f g h i j "WebCrawler's History" . www.thinkpink.com . Archived from the original on 2005-11-28 . Retrieved 2019-01-09 .

^ Lammle, Rob (2012-03-16). " '90s Tech Icons: Where Are They Now?" . Mashable . Archived from the original on 2012-03-17 . Retrieved 2019-02-18 .

^ "Se-En" . searchenginearchive.com . Retrieved 2019-01-25 .

^ "WebCrawler Select: Review Categories" . WebCrawler . 1996-10-24. Archived from the original on 1996-10-24 . Retrieved 2019-02-03 .

^ Keogh, Garret. "Excite buys WebCrawler from AOL" . ZDNet . Retrieved 2019-01-15 .

^ Sullivan, Danny (1997-06-16). "The Search Engine Update, June 17, 1997, Number 7" . Search Engine Watch . Archived from the original on 2016-04-14 . Retrieved 2019-02-02 .

^ R. Notess, Greg (2002). "On the Net: Dead Search Engines" . InfoToday . Archived from the original on 2002-05-25 . Retrieved 2019-01-16 .

^ Brid-Aine Parnell (December 18, 2012). "Search engines we have known ... before Google crushed them" . The Register . Retrieved November 17, 2016 .

^ "Leading Leaders" . A9 Management web page . Archived from the original on November 14, 2016 . Retrieved November 15, 2016 .

^ "Blucora to sell InfoSpace business for $45 million" . Seattle Times . July 5, 2016.

^ "System1 raises $270 million for 'consumer intent' advertising" . L.A. Biz . Retrieved 2017-12-01 .

^ "WebCrawler Search" . WebCrawler . 2018-05-31. Archived from the original on 2018-05-31 . Retrieved 2019-02-02 .

^ "WebCrawler Search" . WebCrawler . 2018-11-30. Archived from the original on 2018-11-30 . Retrieved 2019-02-02 .

^ McGuigan, Brendan (2007). "What was the First Search Engine?" . WiseGeek . Archived from the original on 2007-04-27 . Retrieved 2019-02-18 .

^ "Search Engine History.com" . www.searchenginehistory.com . Retrieved 2019-01-25 .

^ "Infographic: Top 20 Most Popular Websites (1996-2013)" . TechCo . 2014-12-26 . Retrieved 2019-01-15 .

WebCrawler is a search engine , and one of the oldest surviving search engines on the web today. For many years, it operated as a metasearch engine . WebCrawler was the first web search engine to provide full text search. [1]

Brian Pinkerton first started working on WebCrawler, which was originally a desktop application, on January 27, 1994 at the University of Washington . [2] On March 15, 1994, he generated a list of the top 25 websites. [1]

WebCrawler launched on April 21, 1994, with more than 4,000 different websites in its database [2] and on November 14, 1994, WebCrawler served its 1 millionth search query [2] for "nuclear weapons design and research". [3]

On December 1, 1994, WebCrawler acquired two sponsors, DealerNet and Starwave , which provided money to keep WebCrawler operating. [2] Starting on October 3, 1995, WebCrawler was fully supported by advertising, but separated the adverts from search results. [2]

On June 1, 1995, America Online (AOL) acquired WebCrawler. [2] After being acquired by AOL, the website introduced its mascot "Spidey" on September 1, 1995. [2]

Starting in April 1996, [2] WebCrawler also included the human-edited internet guide GNN Select , which was also under AOL ownership. [4] [5]

On April 1, 1997, Excite acquired WebCrawler from AOL for $12.3 million. [2] [6]

WebCrawler received a redesign on June 16, 1997, adding WebCrawler Shortcuts, which suggested alternative links to material related to a search topic. [7]

WebCrawler was maintained by Excite as a separate search engine with its own database until 2001, when it started using Excite's own database, effectively putting an end to WebCrawler as an independent search engine. [8] Later that year, Excite (then called Excite@Home ) went bankrupt and WebCrawler was bought by InfoSpace in 2001. [2]

Pinkerton, WebCrawler's creator, led the Amazon A9.com search division as of 2012. [9] [10]

In July 2016, InfoSpace was sold by parent company Blucora to OpenMail for $45 million, putting WebCrawler under the ownership of OpenMail. [11] OpenMail was later renamed System1. [12]

In 2018, WebCrawler was redesigned from scratch and the logo of the search engine was changed. [13] [14]

WebCrawler was highly successful early on. [15] At one point, it was unusable during peak times due to server overload. [16] It was the second most visited website on the internet in February 1996, but it quickly dropped below rival search engines and directories such as Yahoo! , Infoseek , Lycos , and Excite in 1997. [17]

April 20, 1994 ; 28 years ago ( 1994-04-20 )

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What is a Webcrawler and where is it used?
Difficulty Level :
Expert Last Updated :
09 Jul, 2021
// Java program to illustrate the WebCrawler
    / /FIFO order required for BFS
    // Constructor for initializing the
            = new LinkedList<>();
    // Function to start the BFS and
    public void discover(String root)
        // Storing the root URL to
        this .discovered_websites.add(root);
        // It will loop until queue is empty
        while (!queue.isEmpty()) {
            // To store the URL present in
            // the front of the queue
            String v = queue.remove();
            // To store the raw HTML of
            String raw = readUrl(v);
            // Regular expression for a URL
                = " https:// (\\w+\\.)*(\\w+)" ;
            // To store the pattern of the
            // URL formed by regex
                = Pattern.compile(regex);
            // To extract all the URL that
            // matches the pattern in raw
                = pattern.matcher(raw);
            // It will loop until all the URLs
            // in the current website get stored
            while (matcher.find()) {
                // To store the next URL in raw
                String actual = matcher.group();
                // It will check whether this URL is
                if (!discovered_websites
                         .contains(actual)) {
                    // If not visited it will add
                    // this URL in queue, print it
                    // and mark it as visited
                    discovered_websites
                        .add(actual);
                    System.out.println(
                        "Website found: "
                        + actual);
                    queue.add(actual);
    // Function to return the raw HTML
    public String readUrl(String v)
        // Initializing empty string
        // Use try-catch block to handle
        // any exceptions given by this code
            // Convert the string in URL
            URL url = new URL(v);
            // Read the HTML from website
                = new BufferedReader(
                    new InputStreamReader(
                        url.openStream()));
            // Read the HTML line by line
            // and append it to raw
                    = br.readLine())
            // Close BufferedReader
    public static void main(String[] args)
        // Creating Object of WebCrawler
            = " https:// www.google.com" ;
        web_crowler.discover(root);
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Got It !
Web Crawler is a bot that downloads the content from the internet and indexes it. The main purpose of this bot is to learn about the different web pages on the internet. This kind of bots is mostly operated by search engines. By applying the search algorithms to the data collected by the web crawlers, search engines can provide the relevant links as the response for the request requested by the user. In this article, let’s discuss how the web crawler is implemented.
Webcrawler is a very important application of the Breadth-First Search Algorithm. The idea is that the whole internet can be represented by a directed graph:
Approach: The idea behind the working of this algorithm is to parse the raw HTML of the website and look for other URL in the obtained data. If there is a URL, then add it to the queue and visit them in breadth-first search manner.
Note: This code will not work on an online IDE due to proxy issues. Try to run on your local computer.
Applications: This kind of web crawler is used to acquire the important parameters of the web like:
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