Simple hello world api using finagle - Error: object twitter is not a member of package com import com.twitter.finagle.Http - scala

Question

Im really new to this microservice world and was trying to learn from scratch. But for some reason not able to call a simple dependency.
Getting the error
object twitter is not a member of package com import
com.twitter.finagle._
SBT file, Ive tried three ways
Trial 1
name := "microservicestest"
version := "0.1"
scalaVersion := "2.12.15"
libraryDependencies ++= Seq(
"com.github.finagle" %% "finch-core" % "0.31.0",
"com.github.finagle" %% "finch-circe" % "0.31.0",
"io.circe" %% "circe-generic" % "0.9.0"
)
Trial 2 (puttting just the dependency line in here)
libraryDependencies += "com.twitter" %% "finagle-http" % "21.8.0"
Trial 3
libraryDependencies ++= Seq(
"com.github.finagle" %% "finch-core" % "0.15.1"
)
Scala file
import io.finch._
import com.twitter.finagle.Http
import com.twitter.util.Await
object HelloWorld extends App {
val api: Endpoint[String] = get("hello") { Ok("Hello, World!") }
Await.ready(Http.server.serve(":8080", api.toServiceAs[Text.Plain]))
}

Answer 1

SBT file
libraryDependencies += "com.twitter" %% "finagle-http" % "21.8.0"
Working simple code
import com.twitter.finagle.{Http, Service}
import com.twitter.finagle.http
import com.twitter.util.{Await, Future}
object HelloWorld extends App {
val service = new Service[http.Request, http.Response] {
def apply(req: http.Request): Future[http.Response] =
Future.value(http.Response(req.version, http.Status.Ok))
}
val server = Http.serve(":8080", service)
Await.ready(server)
}