I am working on acquiring a token from my Portal's generateToken endpoint (https://<host>:<port>/arcgis/sharing/rest/generateToken). In order to get the token I need to submit my POST request over HTTPS. I've followed ESRI's online instructions for submitting the username and password in the body of the request and that works but I am wondering if it would be possible to put the creds in an authorization header instead. The creds belong to a built in account. I've tried the standard Basic Auth and X-ESRI-Authorization Basic headers. Neither work. A link to the online instructions I've been following is provided below.
Generate Token—ArcGIS REST API | ArcGIS for Developers
