List the message header fields
GET
/api/v1/messages/{id}/headers
Returns the header section only, in wire order, with duplicates preserved and folded lines joined by a single space. Cheaper than fetching the raw source when only the headers are needed.
Responses
Header fields in wire order
application/json
JSON { "name": "Subject", "value": "Welcome aboard" }
[
]
GET
/api/v1/messages/{id}/headers