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## Appendix H. Migrating from Cowboy 2.9 to 2.10

Cowboy 2.10 is a maintenance release adding support for Erlang/OTP 26. The main change is a Cowlib update to fix a compilation error that only occurs starting from OTP 26.

Cowboy 2.10 requires Erlang/OTP 22.0 or greater.

## H.1. Features added

- Add support for `Default` value of SameSite cookie attribute.
- Add support for the `stale-*` cache-control directives from RFC 5861.
- Update Cowlib to 2.12.1.

## H.2. Bugs fixed

- Fix a compilation error in Cowlib when using Erlang/OTP 26.
- Fix data sent after RST_STREAM in HTTP/2 in rare cases.
- Fix parsing of RST_STREAM frames to properly handle frames that have a valid length but were not fully received yet.
- Remove the obsolete `Version` cookie attribute.
- Handle more edge cases for cookie parsing based on updates to the RFC 6265bis draft.
- Make Basic auth parsing ignore unknown authentication parameters and generally update the code to conform to RFC 7617.
- Fix URI template reserved expansion of %-encoded.
- Update structured headers implementation to RFC 8941.

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