* java.util.zip.DataFormatException after enabling permessage-deflate ([KTOR-5979](https://youtrack.jetbrains.com/issue/KTOR-5979))
* DelegatingTestingClientEngine fails when ContentNegotiation with protobuf is installed and empty body ([KTOR-6125](https://youtrack.jetbrains.com/issue/KTOR-6125))
* KtorServlet does not support yaml configuration ([KTOR-6108](https://youtrack.jetbrains.com/issue/KTOR-6108))
* CIO ConnectionFactory leaks on cancellation ([KTOR-6127](https://youtrack.jetbrains.com/issue/KTOR-6127))
* staticFiles responds twice if both index and defaultPath are set ([KTOR-6120](https://youtrack.jetbrains.com/issue/KTOR-6120))
* Uncaught Kotlin exception: kotlin.IllegalArgumentException: Failed to open iconv for charset UTF-8 with error code 22 ([KTOR-5980](https://youtrack.jetbrains.com/issue/KTOR-5980))
* Not compatible with kotlinx-html 0.9.1 ([KTOR-6124](https://youtrack.jetbrains.com/issue/KTOR-6124))
* "Test engine is already completed" error while establishing Websockets connection ([KTOR-6057](https://youtrack.jetbrains.com/issue/KTOR-6057))
* s-maxage is not used, even if `HttpCache.Config.isShared` is true ([KTOR-6087](https://youtrack.jetbrains.com/issue/KTOR-6087))
* Cache returns null when vary header set different ways whatever it has same values ([KTOR-6081](https://youtrack.jetbrains.com/issue/KTOR-6081))
* DefaultRequest: a cookie appears twice in the request header when sending a request with another cookie ([KTOR-5619](https://youtrack.jetbrains.com/issue/KTOR-5619))
### Improvements
* Drop linuxArm64 publication from ktor-client-curl ([KTOR-6154](https://youtrack.jetbrains.com/issue/KTOR-6154))
