code: protected boolean canRegister(Route route, ControllerHandler handler) {
  
          if (!METHODS.contains(route.getRequestMethod().toUpperCase())) {
              log.debug("Skip {} {}, {} Swagger does not support specified HTTP method",
                      route.getRequestMethod(), route.getUriPattern(), Util.toString(handler.getControllerMethod()));
              return false;
          }
  
          List<String> produces = handler.getDeclaredProduces();
          if (produces.isEmpty()) {
              log.debug("Skip {} {}, {} does not declare @Produces",
                      route.getRequestMethod(), route.getUriPattern(), Util.toString(handler.getControllerMethod()));
              return false;
          }
  
          if (handler.getDeclaredReturns().isEmpty()) {
              log.debug("Skip {} {}, {} does not declare expected @Returns",
                      route.getRequestMethod(), route.getUriPattern(), Util.toString(handler.getControllerMethod()));
              return false;
          }
  
          if (handler.getControllerMethod().isAnnotationPresent(Undocumented.class)
                  || handler.getControllerMethod().getDeclaringClass().isAnnotationPresent(Undocumented.class)) {
              log.debug("Skip {} {}, {} is annotated as @Undocumented",
                      route.getRequestMethod(), route.getUriPattern(), Util.toString(handler.getControllerMethod()));
              return false;
          }
  
          if (!route.getUriPattern().startsWith(relativeSwaggerBasePath)) {
              log.debug("Skip {} {}, {} route is not within Swagger basePath '{}'",
                      route.getRequestMethod(), route.getUriPattern(), Util.toString(handler.getControllerMethod()),
                      relativeSwaggerBasePath);
              return false;
          }
  
          return true;
      }
docs: Determines if this controller handler can be registered in the Swagger specification.
  
  @param route
  @param handler
  @return true if the controller handler can be registered in the Swagger specification