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v4.19.1

punkpeye/fastmcpv4.19.1Sep 4, 2026by github-actions[bot]

AI Summary

This is a maintenance release focused on bug fixes related to authentication and HTTP stream handling to ensure proper resource cleanup and authentication efficiency.

Key Highlights

  • Fixes CIMD response body cancellation on early return paths
  • Optimizes HTTP authentication to occur once per stream request
  • Improves stability of authentication flows

Full Release Notes

## [4.19.1](https://github.com/punkpeye/fastmcp/compare/v4.19.0...v4.19.1) (2026-09-04)


### Bug Fixes

* **auth:** cancel CIMD response body on early-return paths ([#354](https://github.com/punkpeye/fastmcp/issues/354)) ([5b68657](https://github.com/punkpeye/fastmcp/commit/5b68657dad4901e2e92236df472e7f1d56002cef))
* **http:** authenticate once per httpStream request ([#355](https://github.com/punkpeye/fastmcp/issues/355)) ([da55e21](https://github.com/punkpeye/fastmcp/commit/da55e21bef831afefaccdbc5e7af79c47de171cf))