x-amz-rid

When an x-amz-date header is present the system ignores any Date header when authenticating the request. The time stamp must be within 15 minutes of the AWS system time when the request is received. If it isn't the request fails with the RequestExpired error code to prevent someone else from replaying your requests

Header usage statistics

x-amz-rid response header information and usage statistics.

Websites using header x-amz-rid	550
Percentage of websites that use x-amz-rid header	less than 0.1%
Total discovered header values	549
Header uses directives	No
Header values are unique or random	Yes
Most popular in the country	United States