Re:Google’s look, evolved
by f0under on Tuesday September 01, 2015 @06:57PM
(#10156376)
Anything after "?" is a query parameter that the server can read and then apply additional logic to for a response. In this case, they have code that responds to new logo and returns the new logo instead of the previous one.
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It's actually not querying anything, since it works for any query you pass. What happens is that you're bypassing cache because you're loading a different page, as explained by sirn above.