Problem with 204 response and Chrome

Hello, we use 204 response (by adding send_image=0 in request)
But in chrome we see that when browser gets 204 response - it is generate some additional identical requests to piwik (about 4). So we added send_image=1 and now only one request goes to piwik.

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The question is, why in the preparation of 204 - th code, the browser sends repeated requests and how to fix it ?