我想从URL发出请求，但遇到了问题：

val f: Future[Any] = actor1 ? SyncRequest(url)
  f.onSuccess {
    case feed: xml.Elem => 
      val feedInfo = FeedInfo(
              ((feed \ "channel") \ "title").headOption.map(_.text).get,
              ((feed \ "channel") \ "description").headOption.map(_.text),
              ((feed \ "channel") \\ "item").map(item =>
                FeedItem((item \ "title").headOption.map(_.text).get,
                          (item \ "link").headOption.map(_.text))
              ).toList
            )

      complete(feedInfo)

这是错误：

[error] value onSuccess is not a member of scala.concurrent.Future[Any]
[error]                 f.onSuccess {
[error]                     ^
[error] one error found
[error] (Compile / compileIncremental) Compilation failed

也许我必须使用类似OnComplete的东西，而不是OnSuccess？