x-amz-cf-id

CloudFront adds the X-Amz-Cf-Id header to the viewer request before forwarding the request to your origin. The header value contains an encrypted string that uniquely identifies the request. (Describes how CloudFront processes viewer requests and responses for your custom origin server)

Header usage statistics

x-amz-cf-id response header information and usage statistics.

Websites using header x-amz-cf-id	721,009
Percentage of websites that use x-amz-cf-id header	0.89%
Total discovered header values	More than 10,000
Header uses directives	No
Header values are unique or random	No
Most popular in the country	United States