code: protected void registerResponse(Swagger swagger, Operation operation, Return aReturn) {
          Response response = new Response();
          response.setDescription(translate(aReturn.descriptionKey(), aReturn.description()));
  
          Class<?> resultType = aReturn.onResult();
          if (Exception.class.isAssignableFrom(resultType)) {
              Property errorProperty = registerErrorModel(swagger);
              response.setSchema(errorProperty);
          } else if (Void.class != resultType) {
              // Return type
              if (resultType.isArray()) {
                  // ARRAY[]
                  Class<?> componentClass = resultType.getComponentType();
                  ArrayProperty arrayProperty = new ArrayProperty();
                  Property componentProperty = getSwaggerProperty(swagger, componentClass);
                  arrayProperty.setItems(componentProperty);
                  response.setSchema(arrayProperty);
              } else {
                  // Object
                  Property returnProperty = getSwaggerProperty(swagger, resultType);
                  response.setSchema(returnProperty);
              }
          }
  
          for (Class<? extends ReturnHeader> returnHeader : aReturn.headers()) {
              Tag headerTag = getModelTag(returnHeader);
              ReturnHeader header = ClassUtil.newInstance(returnHeader);
              Property property = getSwaggerProperty(swagger, header.getHeaderType());
              if (property instanceof ArrayProperty) {
                  // FIXME swagger-core has incomplete response header specification methods :(
                  ArrayProperty arrayProperty = (ArrayProperty) property;
              }
              property.setName(headerTag.getName());
              property.setDescription(headerTag.getDescription());
              response.addHeader(property.getName(), property);
          }
  
          operation.response(aReturn.code(), response);
      }
docs: Registers a declared response for the operation.
  
  @param swagger
  @param operation
  @param aReturn