- [#876](https://github.com/honojs/middleware/pull/876) [`a092ffaadb3a265a207acc558e6cd021fc3bb6d9`](https://github.com/honojs/middleware/commit/a092ffaadb3a265a207acc558e6cd021fc3bb6d9) Thanks [@HusamElbashir](https://github.com/HusamElbashir)! - Fixed case-sensitivity of the WebSocket "Upgrade" header value
- [#648](https://github.com/honojs/middleware/pull/648) [`139e34a90775d25a61002baeb84d7927b9d75b70`](https://github.com/honojs/middleware/commit/139e34a90775d25a61002baeb84d7927b9d75b70) Thanks [@Yovach](https://github.com/Yovach)! - Add a `CloseEvent` class to avoid exception "CloseEvent is not defined"
- [#539](https://github.com/honojs/middleware/pull/539) [`ec6ec4ec02f8db46e3151e7334535e562dfc47e3`](https://github.com/honojs/middleware/commit/ec6ec4ec02f8db46e3151e7334535e562dfc47e3) Thanks [@mikestopcontinues](https://github.com/mikestopcontinues)! - create only one WebSocketServer instead of per websocket request