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I've seen this bug floated around a few times, with the request parameters and all. Interestingly enough, you do not have to use an image either, and can link to any document on the server. In addition, it will work with nondeterministic values. So you can do (for example):

    =image(CONCATINATE("http://example.com/?", RAND()))
If you add this to a spreadsheet and fill a few thousand rows with it. Each time the spreadsheet is loaded, google will hit the server a few thousand times.

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