How to Trigger In-Sight Vision Suite IS2800/IS3800 Cameras via HTTP

How to trigger In-Sight Vision Suite IS2800/IS3800 cameras via HTTP?

Answer

To be able to trigger camera via HTTP Post request at first we have to openSession and login with admin privileges described in

000001845 [In-Sight] How To Open a Session Via HTTP With In-Sight Vision Suite Cameras 
(https://community.cognex.com/s/article/webskd-how-to-open-session-via-http-with-in-sight-vision-suite-cameras)

After logged in we have to send following POST request

POST <cameraIP>/<SessionID>/manualTrigger 

In reply we should get HTTP 200 OK.