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http4k is a lightweight but fully-featured HTTP toolkit written in pureKotlin that enables the serving and consuming of HTTPservices in a functional and consistent way.http4k applications arejust Kotlin functions. For example, here's a simple echo server:

val app:HttpHandler= { request:Request->Response(OK).body(request.body) }val server= app.asServer(SunHttp(8000)).start()

You can read about the rationale and ethos of http4khere

Thehttp4k platform consists of the following main ecosystems, all released under a single version:

• http4k-core consists of a lightweight core library providing a base HTTP implementation and Server/Client implementations based on the JDK classes. Further servers, clients, serverless, templating, websockets capabilities are then implemented in add-on modules.http4k apps can be simply mounted into a running Server, Serverless platform, or compiled to GraalVM and run as a super-lightweight binary.
• http4k-connect is a lightweight API Client toolkit which includes libraries for connecting to popular third-party cloudservices and AI backends usinghttp4k compatible APIs, along with Fake implementations for usage during localtesting.

You can find out all about the project on thehttp4k site.

dependencies {// install the platform...    implementation(platform("org.http4k:http4k-bom:<LATEST_VERSION>"))// ...then choose any moduless but at least the core    implementation("org.http4k:http4k-core")}

• Dan Bodart'sutterlyidle
• Ivan Moore for pairing on the original hackday project - Barely Magical.
• You can see the amazing people and companies who have helped us to make http4khere.