This new version uses Kotlin 2.0 and switches to kotlinx-io, making Ktor more up to date and better connected with other Kotlin tools. Ktor 3.0 works

Ktor 3.0 Is Now Available With New Features and Improved Performance

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2024-10-10 22:30:01

This new version uses Kotlin 2.0 and switches to kotlinx-io, making Ktor more up to date and better connected with other Kotlin tools. Ktor 3.0 works faster and gives you more options for building client-server applications.

If you’re new to Ktor or need a reminder about how it works, our recent blog post, Ktor 101: Efficient JVM HTTP Toolkit, explains its main features.

The biggest change in this new version is the switch to the kotlinx-io library, which is based on Okio. This change may affect you if you use Ktor’s low-level IO APIs. We made this change to standardize IO functionality across Kotlin libraries and improve performance, as shown in our benchmarks.

The changes mainly affect low-level IO APIs, including classes like Input, Output, ByteReadChannel, and ByteWriteChannel. If you use these classes directly, you’ll see deprecation warnings. You should update your code to use the alternatives provided by the kotlinx-io library. Don’t worry – we’ll keep supporting the old APIs until version 4.0, giving you ample time to migrate.

The new kotlinx-io library offers a multiplatform API that can handle various data sources and provides a range of capabilities, including working with files, using compression, and more. For more details, check out the kotlinx-io API documentation.