code: @Override
      public RelationshipFeed getUserRelationship(String userId) throws InstagramException {
          Preconditions.checkEmptyString(userId, USER_ID_CANNOT_BE_NULL_OR_EMPTY);
  
          String apiMethod = format(Methods.USERS_ID_RELATIONSHIP, userId);
          return createInstagramObject(Verbs.GET, RelationshipFeed.class, apiMethod, null);
      }
docs: /* (non-Javadoc)
  @see org.jinstagram.InstagramClient#getUserRelationship(java.lang.String)