---
title: Javascript-SDK - 6.3.0
slug: feature-experimentation/release-notes/javascript-sdk-6-3-0
docTags: 
createdAt: 2026-07-20T15:45:25.725Z
---

## \[6.3.0] - November 19, 2025

[#630---november-19-2025](docId\:aA2J_2etei0IW8ueXFiLa)

### New Features

[#new-features](docId\:aA2J_2etei0IW8ueXFiLa)

- **Added Holdouts support**: Holdouts Feature Experimentation feature is now officially supported.
- **Added configurable prediction endpoint**: Added ability to configure custom prediction endpoint for CMAB ([#1102](https://github.com/optimizely/javascript-sdk/pull/1102))
- **Added HTTP support in NodeRequestHandler**: Added support for HTTP protocol in addition to HTTPS ([#1104](https://github.com/optimizely/javascript-sdk/pull/1104))
- **Added TTL support for events in event store**: Events in event store now have configurable time-to-live (TTL) functionality ([#1103](https://github.com/optimizely/javascript-sdk/pull/1103))
- **Exposed maxRetries option for createBatchEventProcessor**: Added ability to configure maximum retry attempts for batch event processing ([#1106](https://github.com/optimizely/javascript-sdk/pull/1106))
- **Added customHeaders option to polling config manager**: Added support for custom HTTP headers in polling config manager ([#1107](https://github.com/optimizely/javascript-sdk/pull/1107))

### Changed

[#changed](docId\:aA2J_2etei0IW8ueXFiLa)

- **Excluded CMAB from user profile service**: CMAB experiments are now properly excluded from user profile service operations ([#1105](https://github.com/optimizely/javascript-sdk/pull/1105))

### Bug Fixes

[#bug-fixes](docId\:aA2J_2etei0IW8ueXFiLa)

- **Fixed ODP logging**: Log error instead of silently ignoring when ODP methods are called without providing an OdpManager ([#1108](https://github.com/optimizely/javascript-sdk/pull/1108))

[https://github.com/optimizely/javascript-sdk/releases/tag/v6.3.0](https://github.com/optimizely/javascript-sdk/releases/tag/v6.3.0)