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Hello @duypnguyen,

Thank you for your answer.

Actually, I don't know where to find the curl command. I'm a beginner using this tool.

I have solved the error "The API host is not valid: An API host must be provided". It was about setting up the .wskprops file. 
But, I still can't invoke the action "generic". I get the error "cannot authorize request, reason: missing x-gw-ims-org-id header".