code: public Observable<ServiceResponse<Page<IdentifierInner>>> listSiteIdentifiersAssignedToHostNameNextSinglePageAsync(final String nextPageLink) {
          if (nextPageLink == null) {
              throw new IllegalArgumentException("Parameter nextPageLink is required and cannot be null.");
          }
          String nextUrl = String.format("%s", nextPageLink);
          return service.listSiteIdentifiersAssignedToHostNameNext(nextUrl, this.acceptLanguage(), this.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<Page<IdentifierInner>>>>() {
                  @Override
                  public Observable<ServiceResponse<Page<IdentifierInner>>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<PageImpl<IdentifierInner>> result = listSiteIdentifiersAssignedToHostNameNextDelegate(response);
                          return Observable.just(new ServiceResponse<Page<IdentifierInner>>(result.body(), result.response()));
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }
docs: List all apps that are assigned to a hostname.
  List all apps that are assigned to a hostname.
  
  ServiceResponse<PageImpl<IdentifierInner>> * @param nextPageLink The NextLink from the previous successful call to List operation.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the PagedList&lt;IdentifierInner&gt; object wrapped in {@link ServiceResponse} if successful.