Http4sClientTest.scala

import cats.effect.{ExitCode, IO, IOApp, Resource}
import org.http4s.HttpRoutes
import org.http4s.client.Client
import org.http4s.client.blaze.BlazeClientBuilder
import org.http4s.dsl.Http4sDsl
import org.http4s.implicits._
import cats.implicits._

object Http4sClientTest extends IOApp {

  override def run(args: List[String]): IO[ExitCode] = {
    val client: Resource[IO, Client[IO]] =
//      realClient.map(c => org.http4s.client.middleware.RequestLogger(true, true)(c))
      stubClient.map(c => org.http4s.client.middleware.RequestLogger(true, true)(c))

    (client use { c =>
      c.expect[String]("https://www.wikipedia.org/").map(_ => println("Done"))
    }).as(ExitCode.Success)
  }

  val realClient: Resource[IO, Client[IO]] =
    BlazeClientBuilder[IO](scala.concurrent.ExecutionContext.global).resource

  val stubClient: Resource[IO, Client[IO]] = {

    val dsl = Http4sDsl[IO]
    import dsl._

    val stubHttpApp = HttpRoutes
      .of[IO] {
        case _ =>
          Ok("Everything's dandy.")
      }
      .orNotFound

    Resource.pure(Client.fromHttpApp(stubHttpApp))
  }
}