When request_id is used, the {request_id} will have a value; otherwise it will be empty.

• header_field is an optional header field name from which to read an existing request ID. If this field name is set and the field contains a valid UUID, it will be used and a new one will not be created. For the sake of your site’s security, do NOT abuse this feature (i.e. don’t use it to track user sessions).

request_id header / Caddy-Request-Id {request_id}

Read the request ID from a request header called X-Request-ID, if present:

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