I posted this under Search Engine Optimization but I need more input on this.

I noticed that Yahoo has started indexing the my static links. However, it has indexed them like: www.domain.com/cat but he desitination links that are mod_rewritten look like www.domain.com/cat/. In other words, when you click on www.domain.com/cat, it does not take you to www.domain.com/cat/. But msn.com has indexed them like www.domain.com/cat and they are linked to www.domain.com/cat/.

If i take www.business.com as an example, yahoo has indexed www.business.com/cat and when you click on the indexed link, it takes you to the right link which would be in this case, www.business.com/cat/ which probabilly is rewritten also.

Any ideas on how to overcome that porblem with yahoo?

I've had this problem before.

The default behavior of web servers is to redirect users entering www.example.com/cat to www.example.com/cat/ but under some implementations of mod rewrite you overrule this. Yahoo (Google's AdWords checker too) doesn't cope with this very well.

The way around it is to hard code the automatic redirect back into your system. This means extending your URL rules so that you capture instances like www.example.com/cat, apply the 301 redirect and forward to www.example.com/cat/

The only instance where this would not work is where you actually have different content at www.example.com/cat from what you have at www.example.com/cat/.