anchor.diff:      }
   }
   ----
  -
   <1> Header information about your API.
   <2> Defining the response
   
  
positive.code: === Using Swagger UI
  
  Swagger UI is included by default when running in `dev` or `test` mode, and can optionally added to `prod` mode.
  See <<openapi-swaggerui.adoc#use-swagger-ui-for-development,the Swagger UI>> Guide for more details.
  
  Navigate to link:http://localhost:8080/q/swagger-ui/[localhost:8080/q/swagger-ui/] and you will see the Swagger UI screen:
  
  
negative.code: public class MyDeclarativeRoutes {
  
      // neither path nor regex is set - match a path derived from the method name
      @Route(methods = Route.HttpMethod.GET)
      @APIResponse(responseCode="200", 
              description="Say hello", 
              content=@Content(mediaType="application/json", schema=@Schema(type=SchemaType.STRING))) // <2>
      void hello(RoutingContext rc) {
          rc.response().end("hello");
      }
  