You are viewing the documentation for the 2.6.12 release in the 2.6.x series of releases. The latest stable release series is 3.0.x.

§Netty Server Backend

Prior to Play 2.6.x, Play used the Netty server backend as the default. In 2.6.x, the default backend was changed to Akka HTTP, but you can still manually select the Netty backend server in your project.


To use the Netty server backend you first need to disable the Akka HTTP server and add the Netty server plugin to your project:

lazy val root = (project in file("."))
  .enablePlugins(PlayScala, PlayNettyServer)

Now Play should automatically select the Netty server for running in dev mode, prod and in tests.

§Manually selecting the Netty server

If for some reason you have both the Akka HTTP server and the Netty HTTP server on your classpath, you’ll need to manually select it. This can be done using the play.server.provider system property, for example, in dev mode:

run -Dplay.server.provider=play.core.server.NettyServerProvider

§Verifying that the Netty server is running

When the Netty server is running the request attribute RequestAttrKey.Server with the value netty will be set for all requests. The Akka HTTP backend will not set a value for this request attribute.

import play.api.mvc.request.RequestAttrKey

class SomeScalaController @Inject()(cc: ControllerComponents) extends AbstractController(cc) {

  def index = Action { request =>
    assert(request.attrs.get(RequestAttrKey.Server) == Option("netty"))
    // ...

import play.api.mvc.request.RequestAttrKey;

public class SomeJavaController extends Controller {

  public Result index() {
    // ...


§Configuring Netty

See the SettingsNetty page.

Next: Deploying your application