code: public Observable<ServiceResponse<Page<SecretItem>>> getSecretVersionsSinglePageAsync(final String vaultBaseUrl, final String secretName) {
          if (vaultBaseUrl == null) {
              throw new IllegalArgumentException("Parameter vaultBaseUrl is required and cannot be null.");
          }
          if (secretName == null) {
              throw new IllegalArgumentException("Parameter secretName is required and cannot be null.");
          }
          if (this.apiVersion() == null) {
              throw new IllegalArgumentException("Parameter this.apiVersion() is required and cannot be null.");
          }
          final Integer maxresults = null;
          String parameterizedHost = Joiner.on(", ").join("{vaultBaseUrl}", vaultBaseUrl);
          return service.getSecretVersions(secretName, maxresults, this.apiVersion(), this.acceptLanguage(), parameterizedHost, this.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<Page<SecretItem>>>>() {
                  @Override
                  public Observable<ServiceResponse<Page<SecretItem>>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<PageImpl<SecretItem>> result = getSecretVersionsDelegate(response);
                          return Observable.just(new ServiceResponse<Page<SecretItem>>(result.body(), result.response()));
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }
docs: List all versions of the specified secret.
  The full secret identifier and attributes are provided in the response. No values are returned for the secrets. This operations requires the secrets/list permission.
  
  @param vaultBaseUrl The vault name, for example https://myvault.vault.azure.net.
  @param secretName The name of the secret.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the PagedList&lt;SecretItem&gt; object wrapped in {@link ServiceResponse} if successful.