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Amazon CloudFront now supports the request header order and header count headers

Amazon CloudFront now supports the “Cloudfront-viewer-header-order” and “Cloudfront-viewer-header-count” headers, enabling customers to track the total number of HTTP headers sent with each request, as well as the order in which the headers were sent. Customers can use the two headers to detect and identify request patterns and compare them to the expected and legitimate patterns. This, used in conjunction with other access control rules, can help customers detect and block any attempts to spoof requests.

Source:: Amazon AWS