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Akka:Http

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Extensions

There are several third party libraries that expand the functionality of Akka Http.

Among those, we want to highlight the following:

  • akka-http-json: Integrate some of the best JSON libs in Scala with Akka HTTP
  • Swakka: A Scala library for creating Swagger definitions in a type-safe fashion wth Akka-Http. Generates Open API (a.k.a. Swagger) from code
  • Guardrail: Guardrail is a code generation tool, capable of reading from OpenAPI/Swagger specification files and generating Akka HTTP code
  • akka-http-cors: Akka Http directives implementing the CORS specifications defined by W3C
  • akka-http-session: Web & mobile client-side akka-http sessions, with optional JWT support
  • sttp: Library that provides a clean, programmer-friendly API to define HTTP requests and execute them using one of the wrapped backends, akka-http among them.

Using Akka HTTP

sbt설정은 아래와 같다. 

"com.typesafe.akka" %% "akka-http"   % "10.1.7" 
"com.typesafe.akka" %% "akka-stream" % "2.5.19" // or whatever the latest version is

Alternatively, you can bootstrap a new sbt project with Akka HTTP already configured using the Giter8 template: 

sbt -Dsbt.version=0.13.15 new https://github.com/akka/akka-http-scala-seed.g8

Example 

import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.http.scaladsl.model._
import akka.http.scaladsl.server.Directives._
import akka.stream.ActorMaterializer
import scala.io.StdIn

object WebServer {
  def main(args: Array[String]) {

    implicit val system = ActorSystem("my-system")
    implicit val materializer = ActorMaterializer()
    // needed for the future flatMap/onComplete in the end
    implicit val executionContext = system.dispatcher

    val route =
      path("hello") {
        get {
          complete(HttpEntity(ContentTypes.`text/html(UTF-8)`, "<h1>Say hello to akka-http</h1>"))
        }
      }

    val bindingFuture = Http().bindAndHandle(route, "localhost", 8080)

    println(s"Server online at http://localhost:8080/\nPress RETURN to stop...")
    StdIn.readLine() // let it run until user presses return
    bindingFuture
      .flatMap(_.unbind()) // trigger unbinding from the port
      .onComplete(_ => system.terminate()) // and shutdown when done
  }
}

See also

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