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The Crawling Module And Web Pages

998 words - 4 pages

With the first one, a collection can have various copies of web pages grouped according to the crawl in which they were found. For the second one, only the most recent copy of web pages is to be saved. For this, one has to maintain records of when the web page changed and how frequently it was changed. This technique is more efficient than the previous one but it requires an indexing module to be run with the crawling module. The authors conclude that an incremental crawler can bring brand new copies of web pages more quickly and maintain the storage area fresher than a periodic crawler.
The web crawler keeps a list of unvisited URLs which is called as frontier. The list is initiate with start URLs which may be given by a user or some different program. Each crawling loop engages selecting the next URL to crawl from the frontier, getting the web page equivalent to the URL, parsing the retrieved web page to take out the URLs and application specific information, and lastly add the unvisited URLs to the frontier. Crawling process may be finished when a specific number of web pages have been crawled. The WWW is observed as a huge graph with web pages as its nodes and links as its edges. A crawler initiates at a few of the nodes and then follows the edges to arrive at other nodes. The process of fetching a web page and take out the links within it is similar to expanding a node in graph search. A topical crawler tries to follow edges that are supposed to lead to portions of the graph that are related to a matter.
The crawling method initialize with a seed URL, extracting links from it and adding them to an unvisited list of URLs, This list of unvisited URLs is known as Frontier. The frontier is basically a agenda of a web crawler that includes the URLs of web pages which is not visited. The frontier may be applied as a FIFO queue in which case breadth-first crawler that can be used to blindly search the Web. The URL which is to be crawl next comes from the top of the queue and the new URLs are added to the bottom of the queue.
To obtain a Web page, client sends a HTTP request for a particular web page and reads the reply of web pages. There must have timeouts of particular we page or web server to make sure that an unnecessary amount of time is not spent on web servers which is slow or in reading large web pages.
When a web page is obtained, then content of web pages is parsed to extract information that will provide and possibly direct the prospect path of the web crawler. Parsing involves the URL extraction from HTML pages or it may involve the more difficult process of meshing up the HTML content.
The functioning of Web crawler [10]...

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