Certain types of navigation may block or entirely prevent search engines spider from reaching your website's content. As search engine spiders crawl the web, they rely on the architecture of hyperlinks to find new documents and revisit those that may have changed. In the analogy of speed bumps and walls, complex links and deep site structures with little unique content may serve as "bumps." Data that cannot be accessed by spiderable links qualify as "walls."
Possible "Speed Bumps" for SE Spiders:
URLs with 2+ dynamic parameters; i.e. http://www.url.com/page.php?id=4&CK=34rr&User=%Tom% (spiders may be reluctant to crawl complex URLs like this because they often result in errors with non-human visitors)
Pages with more than 100 unique links to other pages on the site (spiders may not follow each one)
Pages buried more than 3 clicks/links from the home page of a website (unless there are many other external links pointing to the site, spiders will often ignore deep pages)
Pages requiring a "Session ID" or Cookie to enable navigation (spiders may not be able to retain these elements as a browser user can)
Pages that are split into "frames" can hinder crawling and cause confusion about which pages to rank in the results.
Wednesday, February 13, 2008
Why Spider have difficulty to Crawl a Web Page
at 11:40 PM
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