# Change Log
All notable changes to this project will be documented in this file.
See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
## [4.0.3](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@4.0.2...aws-appsync-subscription-link@4.0.3) (2026-03-30)
**Note:** Version bump only for package aws-appsync-subscription-link
## [4.0.2](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@4.0.1...aws-appsync-subscription-link@4.0.2) (2026-03-19)
### Bug Fixes
* **subscription-link:** move auth credentials from URL query string to Sec-WebSocket-Protocol header ([fb5dd3e](https://github.com/awslabs/aws-mobile-appsync-sdk-js/commit/fb5dd3e))
# [4.1.0] (Unreleased)
### Features
* **aws-appsync-subscription-link:** add `proxy` config option to support routing subscriptions through CloudFront or other CDN proxies ([#710](https://github.com/aws-amplify/amplify-category-api/issues/710))
# [4.0.0](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@4.0.0-next.1...aws-appsync-subscription-link@4.0.0) (2025-11-19)
**Note:** Version bump only for package aws-appsync-subscription-link
## [3.1.3](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@3.1.2...aws-appsync-subscription-link@3.1.3) (2024-01-23)
### Bug Fixes
* exception due to illegal access to item in an empty map ([#747](https://github.com/awslabs/aws-mobile-appsync-sdk-js/issues/747)) ([82cb58e](https://github.com/awslabs/aws-mobile-appsync-sdk-js/commit/82cb58e))
## [3.1.2](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@3.1.1...aws-appsync-subscription-link@3.1.2) (2022-11-17)
### Bug Fixes
* added check for observer ([#735](https://github.com/awslabs/aws-mobile-appsync-sdk-js/issues/735)) ([db8f9ae](https://github.com/awslabs/aws-mobile-appsync-sdk-js/commit/db8f9ae))
## [3.1.1](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@3.1.0...aws-appsync-subscription-link@3.1.1) (2022-10-07)
**Note:** Version bump only for package aws-appsync-subscription-link
# [3.1.0](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@3.0.11...aws-appsync-subscription-link@3.1.0) (2022-06-24)
### Features
* Add keepAliveTimeoutMs config for AppSync WebSocket link ([#724](https://github.com/awslabs/aws-mobile-appsync-sdk-js/issues/724)) ([74b8351](https://github.com/awslabs/aws-mobile-appsync-sdk-js/commit/74b8351))
## [3.0.11](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@3.0.10...aws-appsync-subscription-link@3.0.11) (2022-05-02)
**Note:** Version bump only for package aws-appsync-subscription-link
## [3.0.10](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@3.0.9...aws-appsync-subscription-link@3.0.10) (2022-03-04)
### Bug Fixes
* Port over Amplify fix for subscription race conditions ([#509](https://github.com/awslabs/aws-mobile-appsync-sdk-js/issues/509)) ([#704](https://github.com/awslabs/aws-mobile-appsync-sdk-js/issues/704)) ([92b50c4](https://github.com/awslabs/aws-mobile-appsync-sdk-js/commit/92b50c4))
## [3.0.9](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@3.0.8...aws-appsync-subscription-link@3.0.9) (2021-09-24)
### Bug Fixes
* add type fix to subscription link to fix 'prepare' script ([#669](https://github.com/awslabs/aws-mobile-appsync-sdk-js/issues/669)) ([c5202dc](https://github.com/awslabs/aws-mobile-appsync-sdk-js/commit/c5202dc))
* **aws-appsync-subscription-link:** graphql header refactor to fix IAM-based auth ([#619](https://github.com/awslabs/aws-mobile-appsync-sdk-js/issues/619)) ([#671](https://github.com/awslabs/aws-mobile-appsync-sdk-js/issues/671)) ([dbf4959](https://github.com/awslabs/aws-mobile-appsync-sdk-js/commit/dbf4959))
* remove aws-sdk V2; import aws-sdk V3 packages ([#637](https://github.com/awslabs/aws-mobile-appsync-sdk-js/issues/637)); refactor auth-link, signer, and types ([0996740](https://github.com/awslabs/aws-mobile-appsync-sdk-js/commit/0996740))
## [3.0.8](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@3.0.7...aws-appsync-subscription-link@3.0.8) (2021-07-28)
**Note:** Version bump only for package aws-appsync-subscription-link
## [3.0.7](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@3.0.6...aws-appsync-subscription-link@3.0.7) (2021-07-09)
**Note:** Version bump only for package aws-appsync-subscription-link
## [3.0.6](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@3.0.5...aws-appsync-subscription-link@3.0.6) (2021-02-12)
**Note:** Version bump only for package aws-appsync-subscription-link
## [3.0.5](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@3.0.4...aws-appsync-subscription-link@3.0.5) (2021-01-26)
**Note:** Version bump only for package aws-appsync-subscription-link
## [3.0.4](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@3.0.3...aws-appsync-subscription-link@3.0.4) (2021-01-08)
**Note:** Version bump only for package aws-appsync-subscription-link
## [3.0.3](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@3.0.2...aws-appsync-subscription-link@3.0.3) (2020-10-01)
### Bug Fixes
* Add apollo-utilities dependency to subscription link ([3eeb77e](https://github.com/awslabs/aws-mobile-appsync-sdk-js/commit/3eeb77e))
## [3.0.2](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@2.2.1...aws-appsync-subscription-link@3.0.2) (2020-10-01)
**Note:** Version bump only for package aws-appsync-subscription-link
## [2.2.1](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@2.2.0...aws-appsync-subscription-link@2.2.1) (2020-09-10)
**Note:** Version bump only for package aws-appsync-subscription-link
# [2.2.0](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@2.1.0...aws-appsync-subscription-link@2.2.0) (2020-06-24)
### Bug Fixes
* **aws-appsync-subscription-link:** change relativ ([#564](https://github.com/awslabs/aws-mobile-appsync-sdk-js/issues/564)) ([f9d95a6](https://github.com/awslabs/aws-mobile-appsync-sdk-js/commit/f9d95a6))
### Features
* **aws-appsync-subscription-link:** allow custom headers to be processed by a Subscription resolver's vtl ([#497](https://github.com/awslabs/aws-mobile-appsync-sdk-js/issues/497)) ([6851a36](https://github.com/awslabs/aws-mobile-appsync-sdk-js/commit/6851a36))
# [2.1.0](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@2.0.1...aws-appsync-subscription-link@2.1.0) (2020-04-15)
### Features
* **aws-appsync-subscription-link:** add mock support for websocket subscriptions ([#548](https://github.com/awslabs/aws-mobile-appsync-sdk-js/issues/548)) ([bac8808](https://github.com/awslabs/aws-mobile-appsync-sdk-js/commit/bac8808))
## [2.0.1](https://github.com/awslabs/aws-mobile-appsync-sdk-js/compare/aws-appsync-subscription-link@1.0.1...aws-appsync-subscription-link@2.0.1) (2019-11-15)
**Note:** Version bump only for package aws-appsync-subscription-link
## 1.0.1 (2019-10-11)
### Features
* exporting links ([#470](https://github.com/awslabs/aws-mobile-appsync-sdk-js/issues/470)) ([50185bb](https://github.com/awslabs/aws-mobile-appsync-sdk-js/commit/50185bb))