Not able to publish datasource using rest api in POSTMAN
Postman does not support multi-part mime. We have raised the issue with them, but no luck so far.
Recommend you use cURL. Here is the example from https://help.tableau.com/current/api/rest_api/en-us/REST/rest_api_ref_publishing.htm#publish_data_source
curl "http://MY_SERVER/api/3.4/sites/ff2a8360-3c2b-4b05-a793-7607c602e1fb/datasources" -X POST -H "X-Tableau-Auth:6fSulU7ET8yjpHteQj56MQ|LrkEdTHcmPkWFcD8wOEy29hlVXm8iPo4" -H "Content-Type: multipart/mixed;" -F "[email protected]" -F "[email protected]"