Let's say you change the URL from
/domain.com/folder/product.html to
/domain.com/another_folder/product.htm
and the old (but identical) page goes into supplementals--forever it seems with Google. Will this cause any dupe penalties?

I know it shouldn't but I just noticed that for a particular page, the old one was first and I had to hit the "..we have omitted some entries very similar..." for what's supposed to be the most current page. In this case I had used 301 about a month ago and all the links were pointing to the new page. Too tired to test other links, but this not good.

any ideas, suggestions?

I've seen a site have that with changing from .html to .shtml where Google had them all, first one set going URL only and then the other URL only, but the people did have both sets of pages up at the same time without any 301 - and messed up a bit with linking back to the homepage different ways.

Google caught up with it, and it all went back to normal in a few months with nothing in supplemental or URL only afterwards.

IF you used 301 with mod_alias or mod_rewrite you should be OK. Keep an eye out for a while, and check back and let us know how it goes.

thanks Marcia,
I went for the extreme version. Now the old one shows a 404. I don't trust this 301, since it has been several weeks (5-6) since the domain.com/ was 301d to www.domain.com/ and I still see the dupes. This 404 will be painful, but I hope it works faster to clear things out.


I've seen a site have that with changing from .html to .shtml where Google had them all, first one set going URL only and then the other URL only, but the people did have both sets of pages up at the same time without any 301 - and messed up a bit with linking back to the homepage different ways.

Google caught up with it, and it all went back to normal in a few months with nothing in supplemental or URL only afterwards.

IF you used 301 with mod_alias or mod_rewrite you should be OK. Keep an eye out for a while, and check back and let us know how it goes.