feign 14.0-alpha1

[!WARNING] Pre-release. 14.0 is the API-breaking line: streaming request and response bodies, feign-core split into feign-api + feign-core, Java 11 baseline, and immutable Request/Request.Options/MethodMetadata. Read the migration guide before upgrading. Also includes every fix released in 13.18.

What’s Changed

• feat!: make feign.Request.Body streaming-ready by @yvasyliev in https://github.com/OpenFeign/feign/pull/3360
• refactor: split feign-core into feign-api and feign-core by @velo in https://github.com/OpenFeign/feign/pull/3383
• feat: add streaming support for request bodies in DefaultEncoder by @yvasyliev in https://github.com/OpenFeign/feign/pull/3396
• feat: raise minimum Java version to 11 and apply OpenRewrite best practices by @velo in https://github.com/OpenFeign/feign/pull/3397
• escape crlf and quotes in streaming multipart part headers by @alhudz in https://github.com/OpenFeign/feign/pull/3418
• Windows prevents folder deletion if log file is still locked. There is by @trumpetinc in https://github.com/OpenFeign/feign/pull/3493
• Stop Http2ClientTest from calling live nghttp2.org by @arimu1 in https://github.com/OpenFeign/feign/pull/3503
• Streaming decoder support2 by @trumpetinc in https://github.com/OpenFeign/feign/pull/3551
• Make shared runtime state immutable for v14 by @velo in https://github.com/OpenFeign/feign/pull/3677

New Contributors

• @trumpetinc made their first contribution in https://github.com/OpenFeign/feign/pull/3493

Full Changelog: https://github.com/OpenFeign/feign/compare/13.18…14.0-alpha1

---

Source OpenFeign/feign · 14.0-alpha1 · 2026-11-10 · upstream release

Mirrored verbatim for indexing. All rights belong to the upstream project.