Http4s is a minimal, idiomatic Scala interface for HTTP services.
http4s is a typeful, purely functional HTTP library for client and server applications written in Scala.
Principles
Typeful: http4s uses Scala’s type system to increase self-documentation and compile-time verification. Standard headers are lazily parsed to semantically meaningful types, and typeclasses are provided to encode and decode bodies to several common formats.
Purely functional: The pure functional side of Scala is favored to promote composability and easy reasoning about your code. The core is built on an immutable case class model of HTTP requests and responses, shared by the client and the server.
Asynchronous: Much of the API is built around a scalaz.concurrent.Task. Bodies are modeled as scalaz-streams for performant chunking of large messages in constant memory.
Modular: http4s has a lightweight core with multiple deployment options. Server applications can be deployed to blaze, the native platform, or as a servlet application. Client applications run on either blaze or an async-http-client backend. Several libraries useful in everyday HTTP programming, such as circe and argonaut, are integrated via optional modules.
Community-oriented: http4s is a community-driven project, and aims to provide a welcoming environment for all users. We are proud to be a Typelevel incubator project.
Official website: http://http4s.org/
