WebApi: Notes & Richardson Maturity Model

I forget how I came across this but certainly need to research more on the subject. For now I'll just leave this article here for myself to remind myself later. 
https://martinfowler.com/articles/richardsonMaturityModel.html
What is the Richardson Maturity Model? The Richardson Maturity Model is a way to grade your API according to the constraints of REST. ... The Richardson Maturity Model knows 4 levels (0-3), where level 3 designates a truly RESTful API.

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