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Google compression test

Fr [PersonRank 3]

Friday, April 30, 2010
14 years ago8,571 views

Google has updated its robots file yesterday and we can see a new line :

Disallow: /compressiontest/

There is nothing yet at this URL :
Who knows what Google is doing ?

Roger Browne [PersonRank 10]

14 years ago #

Something to do with bringing their newly-purchased video encoding standard to YouTube perhaps?

Ionut Alex. Chitu [PersonRank 10]

14 years ago #

Nothing that interesting. I've noticed a request to a similar URL when visiting It's just an almost empty HTML file that tests HTTP compression.

Roger Browne [PersonRank 10]

14 years ago #

On February 18th this year, a large number of people were asking why, when they went to the Google search page (at, but also at various country sites including and, the browser was asking to download the file "/compressiontest".

They dug into Google's Javascript, and found that Google was downloading the file into an invisible iframe.

The following day, the Google search page was "fixed" and no longer downloaded the file.

Discussions include:

Probably not related (but you never know) is this project:

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