docs: public com.squareup.okhttp.Call getUniversePlanetsPlanetIdAsync(Integer planetId, String datasource,
              String ifNoneMatch, final ApiCallback<PlanetResponse> callback) throws ApiException {
  
          com.squareup.okhttp.Call call = getUniversePlanetsPlanetIdValidateBeforeCall(planetId, datasource, ifNoneMatch,
                  callback);
          Type localVarReturnType = new TypeToken<PlanetResponse>() {
          }.getType();
          apiClient.executeAsync(call, localVarReturnType, callback);
          return call;
      }