code: public Observable<FoundFaces> findFacesUrlInputAsync(String contentType, BodyModelModel imageUrl, FindFacesUrlInputOptionalParameter findFacesUrlInputOptionalParameter) {
          return findFacesUrlInputWithServiceResponseAsync(contentType, imageUrl, findFacesUrlInputOptionalParameter).map(new Func1<ServiceResponse<FoundFaces>, FoundFaces>() {
              @Override
              public FoundFaces call(ServiceResponse<FoundFaces> response) {
                  return response.body();
              }
          });
      }
docs: Returns the list of faces found.
  
  @param contentType The content type.
  @param imageUrl The image url.
  @param findFacesUrlInputOptionalParameter the object representing the optional parameters to be set before calling this API
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the FoundFaces object