REST API Method: GET /rest/spmmessagetable/{identifier}/spmheaderrule
Retrieves all resource schema elements and values of a Header Rule based on a requested Table Entry ID in a given Message Table.
If no Table Entry ID is specified in the GET, a listing of all Header Rules will be returned along with their associated Table Entry IDs. A Message Table may contain Header Rules, Request Line Rules, and Status Line Rules: all will need to be queried to determine the message table membership. These table entry identifiers can be used to collect resource schema element values via the GET spmmessagetable id - spmheaderrule id method.