Integrations

Http4s provides a standard interface for defining services and clients. This enables an ecosystem of interchangeable server and client backends.

There are also integrations for entities, metrics, and more. Check out the "Related Projects" section of the navigation menu for the complete list of integrations.

Ember

Http4s Ember is a server and client backend developed in the core repository.

Implements HTTP/1 and HTTP/2
Runs on JDK 8+, Node.js 16+, and Scala Native
Pure FP, built with Cats Effect and FS2

libraryDependencies ++= Seq(
  "org.http4s" %% "http4s-ember-server" % "0.23.29",
  "org.http4s" %% "http4s-ember-client" % "0.23.29",
)

Backend Integrations

Backend	Platform	Http Client	Http Server	Websocket Client	Websocket Server	Proxy support (Client)
Ember	JDK 8+ / Node.js 16+ / Native	✅	✅	❌	✅	❌
Blaze	JDK 8+	✅	✅	❌	✅	❌
Netty	JDK 8+	✅	✅	✅	✅	✅
JDK Http Client	JDK 11+	✅	❌	✅	❌	✅
Servlet	JDK 8+	❌	✅	❌	❌	❌
DOM	Browsers	✅	❌	✅	❌	❌
Feral	Serverless	❌	✅	❌	❌	❌

Entity Integrations

Http4s has multiple smaller modules for Entity encoding and decoding support of common types.