Google is the king of redirects

But what do they use?

[yosmc]

Google is doing something that would get me worried if I were them without being Google. :) The are buying a bunch of domains (like google.biz, gogle.com, etc. etc.) and redirecting them all to their main domain, google.com. I think that's pretty brave, I would become extremely afraid that my site gets a penalty for that. ;)

Looks like they have read their own rules very carefully... I simply wonder what they are using for this type of redirect? Can anyone guess? Does anyone know?

[korkus2000]

I am guessing they are using 301 redirects which are fine. As long as it doesn't pick up as duplicate content then it is ok. The redirects change them to google.com.

[Markus]

It's a 302, but that's fine also.

[AthlonInside]

They didn't crawl their own site!

Check their robots.txt

[google.com...]

[yosmc]

It's a 302, but that's fine also.

I really wonder about that. With a 302 redirect, the domain google.biz would be spidered and google.com taken as the content. The result would be both google.biz and google.com in the index with duplicate content.

I know because I changed the page extensions on my site from .html to .php and used a 302 temporary redirect to send visitors from the "old" .html to the "new" .php. Google spidered the whole thing, and as a result, both .html and .php pages showed up in the index with identical, updated contents even 6 months after, although the .html pages were only redirects and didn't really exist.