You need to add -X in front of POST as curl thinks that POST is the host name.
curl -H "X-Auth-Token: 3b4e028c1e6f457595497afc1df37ffb" -X POST -d '{"data":"la-la"}' http://172.18.76.44:9292/v3/artifacts/myartifact/v2.0/91671992-c84e-4723-9024-3c9b6dddf079/description -i
You need to add -X in front of POST as curl thinks that POST is the host name.
curl -H "X-Auth-Token: 3b4e028c1e6f457 595497afc1df37f fb" -X POST -d '{"data":"la-la"}' http:// 172.18. 76.44:9292/ v3/artifacts/ myartifact/ v2.0/91671992- c84e-4723- 9024-3c9b6dddf0 79/description -i