This feature allows you to specify what parameters on your site are dynamic parameters that are content-neutral (that is, they do not effect the content on the page) and are present for other uses. To help you get started, we also show you the parameters that we found as possible candidates in our analysis of your site crawl. You can select one of these parameters and provide actions for them.

For these parameters, you can indicate whether you'd like us to modify the URL by removing the parameter or by using a default value. For example,

1. If you use 'src' on your site for tracking traffic sources, you can ask for the parameter 'src' to be removed from the URL. This would result in URLs on your site to be rewritten as below:
   

   http://example.com/blog?src=feed - rewritten as:

   http://example.com/blog

   http://example.com/store?prod=4&src=ysm - rewritten as:

   http://example.com/store?prod=4

2. If you use 'sid' on your site to track user sessions, and your site does not support a mode without sessions, you can provide a default session id for Y! Search and all our crawlers will rewrite your site URLs to use that session id:
   

   http://example.com/store?prod=4&sid=jnd7234x - rewritten as:

   http://example.com/store?prod=4&sid=yslurp12

   http://example.com/catalog?cat=toys&sid=kasfh234 - rewritten as:

   http://example.com/catalog?cat=toys&sid=yslurp12

We apply this information to every URL of your site that we see reversing the adverse effects of duplication due to dynamic URL parameters.