http://www.google.ca/intl/en/webmasters/guidelines.html reads:
"If you decide to use dynamic pages (i.e., the URL contains a "?"
character), be aware that not every search engine spider crawls dynamic
pages as well as static pages. It helps to keep the parameters short and
the number of them few."
More replies below...
John Patterson wrote:
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.
You misunderstood. I wasn't saying you should be removing parameters. I
was suggesting you canonicalize them. That is, if a user hits:
foo.html?a=1&b=2&c=3 but this is identical to foo.html?a=1 (because b=2
and c=3 are default values) than you need to issue a HTTP redirect from
foo.html?a=1 to foo.html?a=1&b=2&c=3.
Google's guidelines specifically says:
"Allow search bots to crawl your sites without session IDs or arguments
that track their path through the site. These techniques are useful for
tracking individual user behavior, but the access pattern of bots is
entirely different. Using these techniques may result in incomplete
indexing of your site, as bots may not be able to eliminate URLs that
look different but actually point to the same page."
which implies you should not rely upon Sessions for crawler indexing
(in fact, I have read that most crawlers will outright reject any URLs
that make use of sessions). I'm saying that you should focus on ensuring
all BookmarkablePages expose canonicalized paths and redirect pages with
"equivilent" parameter values to those canonicalized paths.
Gili
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