Ktor 3.0 switches to kotlinx.io library
Briefly

Ktor 3.0 transitions to the kotlinx.io library for data handling. This upgrade facilitates efficient byte transformations and minimizes unnecessary data copying, increasing performance.
The support for server-sent events (SSE) in Ktor 3.0 allows servers to push updates to clients over HTTP, creating a streamlined one-way communication channel.
Read at InfoWorld
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