Reproduction of a http/2 specific problem with http4s-ember-server

repro.scala

//> using lib "org.http4s::http4s-ember-server:0.23.19"
//> using lib "org.http4s::http4s-dsl:0.23.19"

package foo

import cats.effect._
import cats.syntax.all._
import org.http4s.implicits._
import org.http4s.ember.server._
import org.http4s._
import org.http4s.dsl.io._
import org.http4s.dsl.request

object Main extends IOApp.Simple {

  // this works (http2 request w/o body):
  //    curl --http2 localhost:8080/hello
  // this works (http1 request w/ body):
  //    curl -X POST -d foo localhost:8080/text
  // this doesn't (http2 request w/ body, server hangs)
  //    curl --http2 -X POST -d foo localhost:8080/text
  //
  // Additionally, impossible to exit the application with a ctrl-c as soon
  // as ANY request has been sent to the server (whether we hit the first path or not)
  val app = HttpApp[IO] {
    case GET -> Root / "hello"           => Ok("hello")
    case request @ POST -> Root / "text" => request.as[String].flatMap(Ok(_))
    case request                         => NotFound()
  }

  def run: IO[Unit] = EmberServerBuilder
    .default[IO]
    .withHttp2
    .withHttpApp(app)
    .build
    .useForever
    .void

}