There is something called &quot;Richardson maturity model&quot;, which pretty clearly specifies different levels of &quot;restfulness&quot;: <a href="http:&#x2F;&#x2F;martinfowler.com&#x2F;articles&#x2F;richardsonMaturityModel.html" rel="nofollow">http:&#x2F;&#x2F;martinfowler.com&#x2F;articles&#x2F;richardsonMaturityModel.htm...</a>