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Topic: Web crawler

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	WebSPHINX: A Personal, Customizable Web Crawler
		A web crawler (also called a robot or spider) is a program that browses and processes Web pages automatically.
		Acme.Spider is an elegant, single-threaded Java web crawler implemented as an Enumeration.
		Mapuccino (formerly known as WebCutter) is a Java web crawler designed specifically for web visualization.
	www-2.cs.cmu.edu /~rcm/websphinx (1412 words)

	Mercator: A Scalable, Extensible Web Crawler - Heydon, Najork (ResearchIndex)
		Mercator: A Scalable, Extensible Web Crawler - Heydon, Najork (ResearchIndex)
		Scalable web 1 Introduction Designing a scalable web crawler comparable to the ones used by the major search engines is a complex endeavor.
		However, due to the competitive nature of the search engine business, there are few papers in the literature describing the challenges and tradeoffs inherent in web crawler design.
	citeseer.ist.psu.edu /heydon99mercator.html (487 words)

	Marvel.com message boards :: View topic - Hate that damn web crawler!!!!
		this is for all you web crawler haters out there.
		(Although he has been reffered to as web crawler one to three times max that I've seen(and one of them was by you)) Darn I blew my entire case.
		Personally, I love the Wall Crawler although some topics on the board have been a bit ‘blergh’ (yes ‘blergh’).
	www.marvel.com /boards/viewtopic.php?p=203694 (324 words)

	Email Spider - Spider Web Crawler Easy to Extract E-mail Addresses
		Targeted spider web crawler to extract e-mail addresses by keyword from a starting-point such as search engine, any website or any CGI page: targeted, quickly and easily.
		Crawler - crawl web along the starting websites, you can specify the spider range and level.
		Specify the maximum extraction depth level relative to starting web site.
	www.1-bulk-email-software.net /spider-web.html (279 words)

	Heritrix - Home Page
		Since our crawler seeks to collect and preserve the digital artifacts of our culture for the benefit of future researchers and generations, this name seemed apt.
		Heritrix is designed to respect the robots.txt exclusion directives and META robots tags, and collect material at a measured, adaptive pace unlikely to disrupt normal website activity.
		Added new prefix ('SURT') scope and filter, compression of recovery log, mass adding of URIs to running crawler, crawling via a http proxy, adding of headers to request, improved out-of-the-box defaults, hash of content to crawl log and to arcreader output, and many bug fixes.
	crawler.archive.org (823 words)

	Fetcher Web Crawler: Technical Overview \| Lucene \| Java-Dev
		First, I want to thank you for putting the web crawler into the Lucene
		I have put together a technical overview of the Fetcher web crawler.
		Web Applications and Managed Hosting Powered by Gossamer Threads Inc.
	www.gossamer-threads.com /lists/lucene/java-dev/17294 (163 words)

	Web Crawler (Site not responding. Last check: )
		A web crawler (also known as a web spider or web robot) is a program or automated script
		With the web crawler you will be able to:
		The web crawler componenet is very easy to use.
	www.noviway.com /Code/Web-Crawler.aspx (199 words)

	About Ask.com: Webmasters
		Web crawling is an essential tool for this approach, and it ensures that we have the most up-to-date search results.
		This may cause the crawler to ask for URLs which no longer exist or which never existed, or to try to make HTTP requests on IP addresses which no longer have a Web server or never had one.
		When the crawler finds a page that contains frames (i.e., it is a frameset), the crawler downloads the component frames and includes their content as part of the original page.
	about.ask.com /en/docs/about/webmasters.shtml (2221 words)

	ScienceDaily: Web crawler
		A web crawler (also known as a web spider or web robot) is a program or automated script which browses the World Wide Web in a methodical, automated manner.
		Web crawlers are mainly used to create a copy of all the visited pages for later processing by a search engine, that will index the downloaded pages to provide fast searches.
		Web crawler -- A web crawler (also known as a web spider or web robot) is a program or automated script which browses the World Wide Web in a methodical, automated manner.
	www.sciencedaily.com /encyclopedia/Web_crawler (1509 words)

	World Wide Web Crawler
		Traditional web crawlers use a server-client architecture where the central server manages all the status information (URLs visited and to visit).
		With the distributed nature of web data, it is natural to crawl the web with ordinary PCs already distributed world wide.
		When a crawler finds a URL in a page, it calculates the hash value of the page and sends it to the node that assumes the value at that time (the home node).
	www2002.org /CDROM/poster/182 (1675 words)

	Web Crawler
		Web crawlers do a breadth-first search of all of the web pages that are directly or indirectly linked to some starting page.
		For the Web Crawler, this means that it would not be reasonable for the program to immediately terminate when it encounters an HTML file containing invalid syntax.
		Please note that the Web Access classes throw exceptions when they encounter file or network I/O errors, which can be a common occurrence when running a web-based application like a web crawler.
	faculty.cs.byu.edu /~rodham/cs240/crawler/index.html (4955 words)

	A Simple Crawler Using C# Sockets - The Code Project - Internet / Network (Site not responding. Last check: )
		A web crawler (also known as a web spider or ant) is a program, which browses the World Wide Web in a methodical, automated manner.
		Web crawlers are mainly used to create a copy of all the visited pages for later processing by a search engine, that will index the downloaded pages to provide fast searches.
		Crawler settings are not complicated, they are selected options from many working crawlers in the market, including settings such as supported MIME types, download folder, number of working threads, and so on.
	www.codeproject.com /cs/internet/Crawler.asp (1653 words)

	Web crawler home page - web crawler results (Site not responding. Last check: )
		Web crawler is mainly used to create a copy of all the visited pages for later processing by a search engine, that will index the downloaded pages to provide fast searches.
		Web Crawlers can also be used for automating maintenance tasks on a web site, such as checking links or validating HTML code.
		objective of a web crawler that is equivalent to freshness, but use a different wording: they propose that a crawler must minimize the fraction of time pages remain outdated.
	www.globalseo.org /Web_crawler.htm (308 words)

	[No title]
		Web crawlers are an essential component of all search engines, and are increasingly becoming important in data mining and other indexing applications, but they must function somewhere between the cushion of Moore's Law and the hard place of the exponential growth of the web.
		Table 3 also shows that while the total number of web pages in the repository at the end of a crawler cycle is similar under each strategy, the total number of obsolete pages is not.
		It was not possible to run the crawler model for a longer period and obtain a useful mathematical solution, nor would the crawler be run for this long in practice without an update of the parameters and reoptimisation.
	www10.org /cdrom/papers/210/index.html (5876 words)

	Implementing an effective Web Crawler
		Web crawler (also known as a Web spider or Web robot) is a program or automated script which browses the World Wide Web in a methodical and automated manner.
		Web crawlers are mainly used to create a copy of all the visited pages for later processing by a search engine, which will index the downloaded pages to provide fast searches.
		Building an effective web crawler to solve your purpose is not a difficult task, but choosing the right strategies and building an effective architecture will lead to implementation of highly intelligent web crawler application.
	www.devbistro.com /articles/Misc/Implementing-Effective-Web-Crawler (1612 words)

	Web Crawler - Search Engine Robots - Search Engine Spiders
		A web crawler (also known as web spider) is a program which browses the World Wide Web in a methodical, automated manner.
		Web crawlers not only keep a copy of all the visited pages for later processing - for example by a search engine but also index these pages to make the search narrower...
		Web crawlers, search engine robots and search engine spiders and how they work.
	www.htmlbasictutor.ca /web-crawler-search-engine.htm (312 words)

	Crawler Help (Site not responding. Last check: )
		This area is for the standalone ones or for those that the crawler does not provide a fully flexed features of all functionalities of the groups.
		Once the crawler downloads the messages for you, you can extract the stories or other text out of the messages or extract the links posted in the messages and crawl them.
		The crawler will pick the currently selected user from the login panel to login if you are not already logged on.
	mywebpage.netscape.com /hdlsoft/help/help.html (4856 words)

	Web Crawler Gaffes
		The solution is to ensure that the rate of your your crawl is limited by your own conservative policy, not by thickness of your pipe, the capabilities of the crawler or the urgency of your paper deadline.
		In one recent instance, a poorly-coded (but fully deployed) web crawler ignorantly used the HTTP 1/1 "keepalive" facility on each crawler connection in an apparent attempt to consume as many resources at the crawled site as possible.
		CSE itself was once victimized by an unthrottled crawler that found a loop in our document tree, a loop that it blythely followed deeper and deeper to no good purpose.
	www.cs.washington.edu /lab/policies/draft/crawler-gaffes-1.html (408 words)

	Become.com's Web Crawler: A Massively Scaled Java Technology Application
		After writing the first crawler -- Crawler A -- entirely in the Java programming language, the company completed a second -- Crawler B -- by writing the fetcher in the Java language and the controller in C++.
		Crawlers share some packages for content analysis, and all content-analysis software used during the crawl is written entirely in the Java language.
		Crawler A, the pure Java technology crawler, has 39,000 lines of Java code functioning on 40 to 50 machines, with a total of 160 to 180 GB of memory, with roughly 5000 threads.
	java.sun.com /developer/technicalArticles/WebServices/become (1862 words)

	What is crawler? - a definition from Whatis.com
		The major search engines on the Web all have such a program, which is also known as a "spider" or a "bot." Crawlers are typically programmed to visit sites that have been submitted by their owners as new or updated.
		Crawlers apparently gained the name because they crawl through a site a page at a time, following the links to other pages on the site until all pages have been read.
		Scooter adheres to the rules of politeness for Web crawlers that are specified in the Standard for Robot Exclusion (SRE).
	searchwebservices.techtarget.com /sDefinition/0,,sid26_gci211854,00.html (327 words)

	Cho, Junghoo; Garcia-Molina, Hector: Parallel Crawlers
		As the size of the Web grows, it becomes imperative to parallelize a crawling process, in order to finish downloading pages in a reasonable amount of time.
		We first propose multiple architectures for a parallel crawler and identify fundamental issues related to parallel crawling.
		Based on this understanding, we then propose metrics to evaluate a parallel crawler, and compare the proposed architectures using 40 million pages collected from the Web.
	dbpubs.stanford.edu:8090 /pub/2002-9 (206 words)

	Stopping the Web Crawler (Site not responding. Last check: )
		When a web crawler crawls without bounds, it is called falling into the fl hole.
		rules to constrain the crawler to download files from a single website, for example, the crawler will stop only when it has downloaded all the pages on that website.
		What you can do, either as a safety net, or as a means of constraining an otherwise unbounded web crawler is to a set maximum file count or a max crawl depth constraint (you can also set both).
	www.velocityscape.com /help/web_package_tutorial/create_a_web_crawler_task/stopping_the_web_crawler.htm (128 words)

	Finding What People Want: Experiences with the WebCrawler
		Because the Web is constantly changing and indexing is done periodically, the WebCrawler includes a second searching component that automatically navigates the Web on demand.
		To actually retrieve documents from the Web, the search engine invokes "agents." The interface to an agent is simple: "retrieve this URL." The response from the agent to the search engine is either an object containing the document content or an explanation of why the document could not be retrieved.
		Still, Web robots are often criticized for being inefficient and for wasting valuable Internet resources because of their uninformed, blind indexing.
	www.thinkpink.com /bp/WebCrawler/WWW94.html (4526 words)

	Writing a Web Crawler in the Java Programming Language
		Search engines use crawlers to find what's on the Web; then they construct an index of the pages that were found.
		Web crawlers start by parsing a specified web page, noting any hypertext links on that page that point to other web pages.
		The most common use is to build an index for a web search engine, but crawlers are also used for other purposes, such as those mentioned in the previous section.
	java.sun.com /developer/technicalArticles/ThirdParty/WebCrawler (1346 words)

	Applying Patterns and Framework Components to Develop a Web Crawler (pt. 3)
		A Web Crawler is a client application that ``visits'' URLs and performs various tasks, such as downloading the contents of the URL, checking the validity of the links in an HTML page, building a title index for a search engine, etc.
		In the third part of this assignment, you'll enhance your Web Crawler solution from part 2 so that can visit all the links from a starting point URL in FIFO order in order to determine if it's valid or not.
		This class should allow your Web crawler to treat an connection as a stream of bytes, similar to the C library stdio streams.
	www.cs.wustl.edu /~schmidt/cs562/crawler3.html (556 words)

	A Web Crawler in Perl \| Linux Journal
		This request asks the web server to which we are connected to send the contents of the file /index.html to us.
		If you had two web sites whose content was to appear in a single search application, these tools would not be appropriate.
		Since we're doing the search against web server documents across the Net, we don't have the advantage of index files; therefore, the search will be slower and more processor-intensive.
	www.linuxjournal.com /article/2200 (2280 words)

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