message: Extract payload to var for inspectability.
diff: @@ -309,7 +309,8 @@ export namespace Gateway {
  connection.addEventListener("abort", () => reject(new IModelError(BentleyStatus.ERROR, "Connection aborted.")));
  this.setOperationRequestHeaders(connection);
  - connection.send(this.serializeParametersForOperationRequest(identifier, ...parameters));
  + const payload = this.serializeParametersForOperationRequest(identifier, ...parameters);
  + connection.send(payload);
  } catch (e) {
  reject(new IModelError(BentleyStatus.ERROR, e));
  }
  