code: public Observable<ServiceResponse<Page<SasDefinitionItem>>> getSasDefinitionsWithServiceResponseAsync(final String vaultBaseUrl, final String storageAccountName, final Integer maxresults) {
          return getSasDefinitionsSinglePageAsync(vaultBaseUrl, storageAccountName, maxresults)
              .concatMap(new Func1<ServiceResponse<Page<SasDefinitionItem>>, Observable<ServiceResponse<Page<SasDefinitionItem>>>>() {
                  @Override
                  public Observable<ServiceResponse<Page<SasDefinitionItem>>> call(ServiceResponse<Page<SasDefinitionItem>> page) {
                      String nextPageLink = page.body().nextPageLink();
                      if (nextPageLink == null) {
                          return Observable.just(page);
                      }
                      return Observable.just(page).concatWith(getSasDefinitionsNextWithServiceResponseAsync(nextPageLink));
                  }
              });
      }
docs: List storage SAS definitions for the given storage account. This operation requires the storage/listsas permission.
  
  @param vaultBaseUrl The vault name, for example https://myvault.vault.azure.net.
  @param storageAccountName The name of the storage account.
  @param maxresults Maximum number of results to return in a page. If not specified the service will return up to 25 results.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;SasDefinitionItem&gt; object