code: public Observable<ServiceResponse<Page<IdentifierInner>>> listSiteIdentifiersAssignedToHostNameSinglePageAsync() {
          if (this.subscriptionId() == null) {
              throw new IllegalArgumentException("Parameter this.subscriptionId() is required and cannot be null.");
          }
          if (this.apiVersion() == null) {
              throw new IllegalArgumentException("Parameter this.apiVersion() is required and cannot be null.");
          }
          final String name = null;
          NameIdentifierInner nameIdentifier = new NameIdentifierInner();
          nameIdentifier.withName(null);
          return service.listSiteIdentifiersAssignedToHostName(this.subscriptionId(), this.apiVersion(), this.acceptLanguage(), nameIdentifier, 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 = listSiteIdentifiersAssignedToHostNameDelegate(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.
  
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the PagedList&lt;IdentifierInner&gt; object wrapped in {@link ServiceResponse} if successful.