REST API send task comment

Hello! I need send comment in task by rest api (with notification preferably).

The comment example from rest api documentation can't add new comment oO

By this example:

I do this:

http://localhost:8080/api/v3/comments?INPUT_DATA={"comments":{"tasks":{"id":"8"},"comment":"Changes have been moved to head"}}

(task 8 present)

not works, no new comment.

I don't know what I'm doing wrong :(

PS. SDP ver 9.2