The instructions don't mention POST anywhere in document so I would concentrate on GET. Also, when you use Chrome, I am pretty sure it's a GET.
Have you tried testing w/ Postman? It might help find an error.
If you don't mind one virtual device per action, you could create one device per action and use this device driver:
Or, just create one to see if the HTTP Get Request works using that virtual device 1st.
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