AutomatedTestRun with rest api

Hi, 

I am trying to create automated test run with rest api. 

as i understand first step is to create shell with the "projects/{project_id}/test-runs/create/test_set/{test_set_id}/automation_host/{automation_host_token}" uri.

Second step is to record with "projects/{project_id}/test-runs/record" uri.

But i can't create shell (first step).  I am trying with postman, post returns as "Could not get any response". When i try it with the browser it returns "Method not allowed."

What am i doing wrong? Can someone help me with creating automated test run with api?

Thank you.