code: public Observable<Map<String, String>> listEndpointsAsync(UUID appId) {
          return listEndpointsWithServiceResponseAsync(appId).map(new Func1<ServiceResponse<Map<String, String>>, Map<String, String>>() {
              @Override
              public Map<String, String> call(ServiceResponse<Map<String, String>> response) {
                  return response.body();
              }
          });
      }
docs: Returns the available endpoint deployment regions and URLs.
  
  @param appId The application ID.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the Map&lt;String, String&gt; object