Value of the correlation ID for the server, i.e., a UUID v4 (with or without the dash to separate the blocks), optionally followed by a ‘#’ and a positive integer.
Match pattern:^[0-9A-Fa-f]{8}-?[0-9A-Fa-f]{4}-?4[0-9A-Fa-f]{3}-?[89ABab][0-9A-Fa-f]{3}-?[0-9A-Fa-f]{12}(#[1-9][0-9]*)?$
The RFC7232 If-None-Match header field in a request requires the server to only operate on the resource if it does not match any of the provided entity-tags. If the provided entity-tag is *, it is required that the resource does not exist at all.
Example:7da7a728-f910-11e6-942a-68f728c1ba70