200 OK: The request succeeded.

200 ok but no content use for some service need to return 200 status but no response body.

201 Created: The request succeeded, and a new resource was created as a result.

204 No Content: There is no content to send for this request, but the headers may be useful.

ContextWithRequest: extract header, method, uri to context.

NewEngie: initial gin engine with default middleware{CORS, ExtractJWT, Recover}.