On Friday 10 Feb 2006 01:04, Gili wrote:
>       For example, if you have a multi-page image gallery, specifying page=0
> would be optional, since it is the default page that gets viewed unless
> you specify otherwise.
>

Again, generally all parameters passed to a page are passed for a reason - 
they alter the page content.

>       Not if you use HTTP redirect. You can have multiple pages with
> identical content if all duplicates redirect to the canonical URL. From
> Google's point of view, it only sees one URL (the canonical one) and it
> disregards any pages which redirect.

You have missed the point.  I was not talking about pages with identical 
content.  If you read my post carefully you will see that I talk about pages 
that are significantly similar but NOT identical.

Such pages MUST have different URLs but perhaps 90% of the content may be the 
same.  Here is an example:

 /showRecord/id/123/userName/Gili
 /showRecord/id/123/userName/John

Every parameter is used to change the displayed page.  These pages would show 
mostly the same content but would only differ in the user name displayed.  
Google would see these as duplicate pages but they *cannot* have the same 
URL.

If one used the form:

/showRecord?id=123&userName=John

Or even better:

/showRecord/id/123?userName=John

Then Google will recognise that the page is dynamic and will not penalise your 
site.  The major search engines no longer have a problem indexing such pages.  
I now use this second hybrid form and traffic has returned to normal.  From 
reading SEO news groups I know that others have had the same problem with 
duplicate content penalties after Google's "Jagger" update.

Hope this helps clarify the problem with passing parameters in the path.

John


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