code: func (s *ContextStoreWithDefault) GetTLSData(contextName, endpointName, fileName string) ([]byte, error) {
  	if contextName == DefaultContextName {
  		defaultContext, err := s.Resolver()
  		if err != nil {
  			return nil, err
  		}
  		if defaultContext.TLS.Endpoints[endpointName].Files[fileName] == nil {
  			return nil, &noDefaultTLSDataError{endpointName: endpointName, fileName: fileName}
  		}
  		return defaultContext.TLS.Endpoints[endpointName].Files[fileName], nil
  
  	}
  	return s.Store.GetTLSData(contextName, endpointName, fileName)
  }
docs: // GetTLSData implements store.Store's GetTLSData