Scala 在Play 2.6中，如何优雅地处理无效的websocket请求？

我们有一个使用websockets的play 2.6应用程序。这非常有效，但在我们的错误日志中，我们偶尔会看到以下内容：

[ERROR] [08/25/2017 16:00:44.770] [play-dev-mode-akka.actor.default-dispatcher-35] [akka.actor.ActorSystemImpl(play-dev-mode)] Internal server error, sending 500 response
java.lang.RuntimeException: WebSocket returned for non WebSocket request
    at scala.sys.package$.error(package.scala:27)
    at play.core.server.AkkaHttpServer.executeHandler(AkkaHttpServer.scala:271)
    at play.core.server.AkkaHttpServer.handleRequest(AkkaHttpServer.scala:201)
    at play.core.server.AkkaHttpServer.$anonfun$createServerBinding$3(AkkaHttpServer.scala:107)
    at akka.stream.impl.fusing.MapAsync$$anon$23.onPush(Ops.scala:1172)
    at akka.stream.impl.fusing.GraphInterpreter.processPush(GraphInterpreter.scala:499)
    at akka.stream.impl.fusing.GraphInterpreter.processEvent(GraphInterpreter.scala:462)
    at akka.stream.impl.fusing.GraphInterpreter.execute(GraphInterpreter.scala:368)
    at akka.stream.impl.fusing.GraphInterpreterShell.runBatch(ActorGraphInterpreter.scala:571)
    at akka.stream.impl.fusing.GraphInterpreterShell$AsyncInput.execute(ActorGraphInterpreter.scala:457)
    at akka.stream.impl.fusing.GraphInterpreterShell.processEvent(ActorGraphInterpreter.scala:546)
    at akka.stream.impl.fusing.ActorGraphInterpreter.akka$stream$impl$fusing$ActorGraphInterpreter$$processEvent(ActorGraphInterpreter.scala:725)
    at akka.stream.impl.fusing.ActorGraphInterpreter$$anonfun$receive$1.applyOrElse(ActorGraphInterpreter.scala:740)
    at akka.actor.Actor.aroundReceive(Actor.scala:513)
    at akka.actor.Actcorrectlyor.aroundReceive$(Actor.scala:511)
    at akka.stream.impl.fusing.ActorGraphInterpreter.aroundReceive(ActorGraphInterpreter.scala:650)
    at akka.actor.ActorCell.receiveMessage(ActorCell.scala:527)
    at akka.actor.ActorCell.invoke(ActorCell.scala:496)
    at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)
    at akka.dispatch.Mailbox.run(Mailbox.scala:224)
    at akka.dispatch.Mailbox.exec(Mailbox.scala:234)
    at akka.dispatch.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
    at akka.dispatch.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
    at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
    at akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

经过一点侦查，当HTTP请求没有正确的

连接

和/或

升级

头时，似乎会发生这种情况。播放源是

我们希望记录更详细的信息以确定发生这种情况的原因（我们怀疑是头部剥离防火墙），但不幸的是，当错误发生时，我们的websocket处理程序从未被调用（没有打印到控制台）：

def ws = WebSocketcorrectly.acceptOrResult[String, String] { implicit request =>
    println("Hello world") // Only printed for requests with valid headers
    ...
}

---

我们如何插入一些访问请求头和IP的日志语句？

我可以确认，当代理/防火墙不支持WebSocket或被禁用时，会发生此错误（我已在WAF中进行了禁用WebSocket的测试，并收到此错误）。谢谢，很高兴知道！在接下来的几天里，我有一些更重要的事情要做，但我会回到这里。下一步要尝试的是使用一个过滤器，如果没有，那么就研究编写一个play插件，并在这里分享我发现的任何东西。如果您有任何进展，请告诉我，我将不胜感激。筛选器不好，因为错误发生在调用它们之前。我向play tracker提交了一个问题：