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digitalmars.D.learn - how to set REST path for gcloud api in vibe.d?

I need to use gcloud NLP api which has the url and endpoint like 
this 
"https://language.googleapis.com/v1beta2/documents:analyzeSentiment". The ":"
between documents and analyzeSentiment make a lot trouble for me. Just don't
know how to setup the  path in RestInterface for such endpoint. I tried many,
including `/documents:analyzeSentiment` but all failed, cannot go to the right
path...

any idea? thank in advance.
Jun 14 2022