X-RequestId Header Field

The X-RequestId header field MUST be a combination of a globally unique value in the format of a GUID followed by an increasing decimal counter which MUST increase with every new HTTP request (for example, "{E2EA6C1C-E61B-49E9-9CFB-38184F907552}:123456"). The GUID portion of the X-RequestId header MUST be unique across all Session Contexts and MUST NOT change for the life of the Session Context. The client MUST send this header on every request and the server MUST return this header with the same information in the response back to the client.