Session ID’s can create huge issues for spiders. The first issue is created when Session IDs are passed in the url string. This practice is commonly used by programmers so they can track a user through the site. The problem here is that the same page will have a different session ID for each user, or each spider from a given search engine. This creates duplicate content and also creates a situation where a given page will never rank.
Cookies create yet another issue. If your site requires cookies to navigate through it then you are preventing your website from being crawled. Spiders don’t accept cookies! If you have the ability to detect spiders based on there ip address it would be best to turn off cookies.
Another issue that could cause problems with spiders and getting your site ranked correctly is if you dynamically draw data on a page based on GEO Location. Here the spider sees a totally different page based on where the spider bot is crawling your page from.
In Closeting be careful with any of these techniques for dynamically drawing content. All of the items mentioned above will either block a spider from crawling you content or will give the spider different content based on when they index your site and from where. |
