limit max connections in the SttpClient

Author: halotukozak

rest/.jvm/src/test/scala/io/udash/rest/SttpRestCallTest.scala

@@ -3,13 +3,22 @@ package rest
 
 import io.udash.rest.raw.HttpErrorException
 import io.udash.rest.raw.RawRest.HandleRequest
-import sttp.client3.SttpBackend
+import sttp.client3.{HttpClientFutureBackend, SttpBackend}
 
-import scala.concurrent.duration._
+import java.net.http.HttpClient
+import java.time.Duration as JDuration
+import scala.concurrent.duration.*
 import scala.concurrent.{Await, Future}
 
 trait SttpClientRestTest extends ServletBasedRestApiTest {
-  implicit val backend: SttpBackend[Future, Any] = SttpRestClient.defaultBackend()
+  implicit val backend: SttpBackend[Future, Any] = HttpClientFutureBackend.usingClient {
+    HttpClient
+      .newBuilder()
+      .executor((_: Runnable).run()) // == MaxConnections = 1
+      .followRedirects(HttpClient.Redirect.NEVER)
+      .connectTimeout(JDuration.ofMillis(30.seconds.toMillis))
+      .build()
+  }
 
   def clientHandle: HandleRequest =
     SttpRestClient.asHandleRequest[Future](s"$baseUrl/api")

rest/src/test/scala/io/udash/rest/RestApiTest.scala

@@ -15,7 +15,6 @@ import org.scalatest.funsuite.AnyFunSuite
 import scala.concurrent.duration.FiniteDuration
 
 abstract class RestApiTest extends AnyFunSuite with ScalaFutures {
-
   protected final val MaxConnections: Int = 1 // to timeout quickly
   protected final val Connections: Int = 10 // > MaxConnections
   protected final val CallTimeout: FiniteDuration = 300.millis // << idle timeout