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Avoid Diffy hits reflected in your analytics, device identification.
You can set up HTTP headers for Diffy workers. We have a few cases when it is really useful.
If your site doesn't get much traffic Diffy's scans will be noticeable. To avoid that you can set
User-Agent: Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)