Armeria is your go-to microservice framework for any situation. You can build any type of microservice leveraging your favorite technologies, including gRPC, Thrift, Kotlin, Retrofit, Reactive Streams, Spring Boot and Dropwizard. Armeria is capable of running services using different protocols, all on a single port. No need for any proxies or sidecars.
 
Armeria's documentation service allows you to browse the complete list of services and their documentation from a web browser. It provides various service discovery mechanisms, from Kubernetes-style DNS records to ZooKeeper data nodes.
 
Armeria is from the creator of <a href="https://netty.io/">Netty</a>&nbsp;and his colleagues at <a href="https://engineering.linecorp.com/en/">LINE</a>

Armeria is your go-to microservice framework for any situation. You can build any type of microservice leveraging your favorite technologies, including gRPC, Thrift, Kotlin, Retrofit, Reactive Streams, Spring Boot and Dropwizard. Armeria is capable of running services using different protocols, all on a single port. No need for any proxies or sidecars.

Armeria - Build any type of microservice leveraging your favorite technologies, including gRPC, Thrift, Kotlin, Retrofit, Reactive Streams, Spring Boot and Dropwizard

The Akka HTTP modules implement a full server- and client-side HTTP stack on top of akka-actor and akka-stream. It's not a web-framework but rather a more general toolkit for providing and consuming HTTP-based services. While interaction with a browser is of course also in scope it is not the primary focus of Akka HTTP. 
 
Akka HTTP follows a rather open design and many times offers several different API levels for "doing the same thing". You get to pick the API level of abstraction that is most suitable for your application. This means that, if you have trouble achieving something using a high-level API, there's a good chance that you can get it done with a low-level API, which offers more flexibility but might require you to write more application code.

The Akka HTTP modules implement a full server- and client-side HTTP stack on top of akka-actor and akka-stream. It's not a web-framework but rather a more general toolkit for providing and consuming HTTP-based services. While interaction with a browser is of course also in scope it is not the primary focus of Akka HTTP. 

Akka HTTP - The Streaming-first HTTP server/module of Akka

http4k is an HTTP toolkit written in Kotlin that enables the serving and consuming of HTTP services in a functional and consistent way. It consists of a core library http4k-core providing a base HTTP implementation + a number of abstractions for various functionalities (such as servers, clients, templating etc) that are provided as optional add-on libraries.
 
http4k apps can be simply mounted into a running Server, Serverless platform, or compiled to GraalVM and run as a super-lightweight binary. In a single line of code you can switch your server between Java (built-in), Apache, Jetty, Netty, Undertow, Ktor, or Ratpack. In a single line of code you can also switch your client implementation between Java (built-in), Apache, Jetty, and OkHttp.

http4k is an HTTP toolkit written in Kotlin that enables the serving and consuming of HTTP services in a functional and consistent way. It consists of a core library http4k-core providing a base HTTP implementation + a number of abstractions for various functionalities (such as servers, clients, templating etc) that are provided as optional add-on libraries.

http4k - HTTP toolkit written in Kotlin that enables the serving and consuming of HTTP services in a functional and consistent way

Http4s is a minimal, idiomatic Scala interface for HTTP services. Http4s is Scala's answer to Ruby's Rack, Python's WSGI, Haskell's WAI, and Java's Servlets.

http4s -  A typeful, purely functional, streaming library for HTTP clients and servers in Scala

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Armeria - Build any type of microservice leveraging your favorite technologies, including gRPC, Thrift, Kotlin, Retrofit, Reactive Streams, Spring Boot and Dropwizard

Akka HTTP - The Streaming-first HTTP server/module of Akka

http4k - HTTP toolkit written in Kotlin that enables the serving and consuming of HTTP services in a functional and consistent way

http4s - A typeful, purely functional, streaming library for HTTP clients and servers in Scala

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Armeria - Build any type of microservice leveraging your favorite technologies, including gRPC, Thrift, Kotlin, Retrofit, Reactive Streams, Spring Boot and Dropwizard

Akka HTTP - The Streaming-first HTTP server/module of Akka

http4k - HTTP toolkit written in Kotlin that enables the serving and consuming of HTTP services in a functional and consistent way

http4s - A typeful, purely functional, streaming library for HTTP clients and servers in Scala

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