Restful API 403 error

[ling_ip]

I am new to Activiti. I have deployed simple workflow through Activiti explorer. Works great. Now I want to use my workflow through Restful API. I can only get the login working. When I use process-definitions API, I got 403 error. I need to authenticate. I cannot find any tutorial or code sample to do this. Can anyone help me? Javascript, jquery or java will help.
Thanks in advance.
Ling

[trademak]

Did you checkout the Activiti in Action book? It contains a full REST client example and includes the authentication part.

Best regards,