On Thursday 09 Feb 2006 11:33, Gili wrote:
>       I don't think this necessary has anything to do with your URL scheme.
> It has to do with having different URLs returning the same (or very
> similar) content.

As you have written immediately below, the problem IS due to the URL scheme.  
People need to be aware that using such a scheme can result in a penalty from 
Google if ANY one of the parameters does not alter the page significantly.

>       The difference is that under niceurl, all URLs are considered
> individual pages whereas under the normal scheme it might be considered
> as a single page with multiple parameters. I believe Google has problems
> indexing the matter whereas if you use the former and different
> parameters yield the same page you will end up penalized.

Google and other major search engines no longer have problems indexing dynamic 
pages (urls with a ?)

>       I would suggest you simply ensure that different parameters always
> result in different content 

Unrealistic.  If any parameter does not alter the page significantly your site 
will be penalised.

> and use HTTP redirects in case different 
> parameters yield the same content. Google will only penalize you if you
> don't HTTP redirect and pretend these are different pages.

If the redirect relies on a user session existing then Google will not even 
index the content page (Google does not support cookies and avoids any url 
with a session id).  If it doesn't rely on a session then all parameters must 
also be present in the redirected page URL which brings us back to the 
original problem.

Generally, steer clear of such a format if you want traffic from Google UNLESS 
every parameter results in a significantly different page.

I have combined the 2 different schemes so that the main parameters are 
included in the URL path and additional ones are in the query string.

/action/main_param_name/main_param_value?parm_name2=param_value2

This works well.

John


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