Update:
May 20, 2021, As of version 8.5.0 – Postman supported WebSocket APIs
Obsolete (original) answer:
This is not possible as of May 2017. There is a request for this if you want to upvote:
github.com/postmanlabs/postman-app-support/issues/4009
Update:
May 20, 2021, As of version 8.5.0 – Postman supported WebSocket APIs
Obsolete (original) answer:
This is not possible as of May 2017. There is a request for this if you want to upvote:
github.com/postmanlabs/postman-app-support/issues/4009