EmberClientCall.scala (trying to work out why we get a stack trace, seems that this is a known issue)

EmberClientCall.scala

import cats.effect.{IO, IOApp}
import org.http4s.{Headers, MediaType, Method, Request}
import org.http4s.ember.client.EmberClientBuilder
import org.http4s.headers.Accept
import org.http4s.implicits.http4sLiteralsSyntax
import org.typelevel.log4cats.LoggerFactory
import org.typelevel.log4cats.slf4j.Slf4jFactory

object EmberClientCall extends IOApp.Simple {

  private implicit val loggerFactory: LoggerFactory[IO] =
    Slf4jFactory.create[IO]

  private val clientResource = EmberClientBuilder
    .default[IO]
    .build

  val run: IO[Unit] = {
    for {
      _ <- IO.println("Hello")
      ret <- clientResource.use {
        client =>
          client.expect[String](
            Request(
              method = Method.GET,
              uri"https://swapi.dev/api/planets/1/?format=json",
              headers = Headers(Accept(MediaType.application.json)),
            )
          )
      }
      _ <- IO.println(s"Have run client $ret")
    } yield ()

  }

}

stdout.txt

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Hello
java.nio.channels.ClosedChannelException
	at java.base/sun.nio.ch.AsynchronousSocketChannelImpl.begin(AsynchronousSocketChannelImpl.java:118)
	at java.base/sun.nio.ch.AsynchronousSocketChannelImpl.shutdownInput(AsynchronousSocketChannelImpl.java:536)
	at fs2.io.net.SocketCompanionPlatform$AsyncSocket.$anonfun$readChunk$3(SocketPlatform.scala:121)
	at delay @ fs2.io.net.SocketCompanionPlatform$AsyncSocket.$anonfun$readChunk$2(SocketPlatform.scala:120)
	at delay @ fs2.io.net.SocketCompanionPlatform$AsyncSocket.$anonfun$readChunk$1(SocketPlatform.scala:120)
	at async @ fs2.io.net.SocketCompanionPlatform$AsyncSocket.readChunk(SocketPlatform.scala:114)
	at flatMap @ fs2.io.net.SocketCompanionPlatform$BufferedReads.$anonfun$read$1(SocketPlatform.scala:82)
	at delay @ fs2.io.net.SocketCompanionPlatform$BufferedReads.withReadBuffer(SocketPlatform.scala:52)
	at clear @ org.http4s.client.middleware.Retry$.retryLoop$1(Retry.scala:92)
	at getAndSet @ org.typelevel.keypool.KeyPool$.destroy(KeyPool.scala:120)
Have run client {"name":"Tatooine","rotation_period":"23","orbital_period":"304","diameter":"10465","climate":"arid","gravity":"1 standard","terrain":"desert","surface_water":"1","population":"200000","residents":["https://swapi.dev/api/people/1/","https://swapi.dev/api/people/2/","https://swapi.dev/api/people/4/","https://swapi.dev/api/people/6/","https://swapi.dev/api/people/7/","https://swapi.dev/api/people/8/","https://swapi.dev/api/people/9/","https://swapi.dev/api/people/11/","https://swapi.dev/api/people/43/","https://swapi.dev/api/people/62/"],"films":["https://swapi.dev/api/films/1/","https://swapi.dev/api/films/3/","https://swapi.dev/api/films/4/","https://swapi.dev/api/films/5/","https://swapi.dev/api/films/6/"],"created":"2014-12-09T13:50:49.641000Z","edited":"2014-12-20T20:58:18.411000Z","url":"https://swapi.dev/api/planets/1/"}

Process finished with exit code 0

Ah, known issue typelevel/fs2#3238 in v3.8.13