code: public Observable<Page<String>> listWebAppsByHybridConnectionAsync(final String resourceGroupName, final String name, final String namespaceName, final String relayName) {
          return listWebAppsByHybridConnectionWithServiceResponseAsync(resourceGroupName, name, namespaceName, relayName)
              .map(new Func1<ServiceResponse<Page<String>>, Page<String>>() {
                  @Override
                  public Page<String> call(ServiceResponse<Page<String>> response) {
                      return response.body();
                  }
              });
      }
docs: Get all apps that use a Hybrid Connection in an App Service Plan.
  Get all apps that use a Hybrid Connection in an App Service Plan.
  
  @param resourceGroupName Name of the resource group to which the resource belongs.
  @param name Name of the App Service plan.
  @param namespaceName Name of the Hybrid Connection namespace.
  @param relayName Name of the Hybrid Connection relay.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;String&gt; object