title: Is there a reference or mature implementation of openapi 3 (3.1 maybe)
body: <p>I am trying to use the OpenAPI 3 specification. However I could not find any mature implementation of it.</p>
  <p>I am aware of this list <a href="https://github.com/OAI/OpenAPI-Specification/blob/main/IMPLEMENTATIONS.md" rel="nofollow noreferrer">https://github.com/OAI/OpenAPI-Specification/blob/main/IMPLEMENTATIONS.md</a> , however after testing 3-4 implementations, I found them all lacking.</p>
  <p>I need a function to parse the spec.
  And then validate the request and response too.</p>
  <p>Alternatively I need a http proxy, which does the same, and proxies the API request to a backend which uses a different parameter format. Translating between the two formats.</p>