code: public Observable<Page<IdentifierInner>> listSiteIdentifiersAssignedToHostNameNextAsync(final String nextPageLink) {
          return listSiteIdentifiersAssignedToHostNameNextWithServiceResponseAsync(nextPageLink)
              .map(new Func1<ServiceResponse<Page<IdentifierInner>>, Page<IdentifierInner>>() {
                  @Override
                  public Page<IdentifierInner> call(ServiceResponse<Page<IdentifierInner>> response) {
                      return response.body();
                  }
              });
      }
docs: List all apps that are assigned to a hostname.
  List all apps that are assigned to a hostname.
  
  @param nextPageLink The NextLink from the previous successful call to List operation.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;IdentifierInner&gt; object