Sagemaker invocation mock with http4s and records4s

SagemakerMock.scala

//> using dep org.http4s::http4s-ember-server:0.23.27
//> using dep org.http4s::http4s-dsl:0.23.27
//> using dep org.http4s::http4s-circe:0.23.27
//> using dep com.github.tarao::record4s-circe:0.13.0
//> using option -Wunused:all
import cats.effect.IO
import cats.effect.IOApp
import com.comcast.ip4s.*
import com.github.tarao.record4s.%
import com.github.tarao.record4s.select
import com.github.tarao.record4s.circe.Codec.given
import org.http4s.HttpRoutes
import org.http4s.circe.CirceEntityCodec.*
import org.http4s.dsl.io.*
import org.http4s.ember.server.EmberServerBuilder
import org.http4s.implicits.*

import scala.concurrent.duration.Duration
import scala.util.Random

object SagemakerMock extends IOApp.Simple {

  val app = HttpRoutes
    .of[IO] {
      case req @ POST -> Root / "endpoints" / endpointName / "invocations" =>
        req.as[% { val inputs: String }].flatMap { case select.inputs(input) =>
          IO.println("input was: " + input) *>
            Ok(
              List.fill(768)(Random.nextFloat())
            )
        }
    }
    .orNotFound

  def run: IO[Unit] = EmberServerBuilder
    .default[IO]
    .withHost(host"0.0.0.0")
    .withPort(port"5050")
    .withHttpApp(
      app
    )
    .withShutdownTimeout(Duration.Zero)
    .build
    .useForever
}