Github user vanzin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21523#discussion_r194814773
  
    --- Diff: core/src/main/scala/org/apache/spark/ui/WebUI.scala ---
    @@ -91,7 +91,12 @@ private[spark] abstract class WebUI(
       /** Attach a handler to this UI. */
       def attachHandler(handler: ServletContextHandler) {
         handlers += handler
    -    serverInfo.foreach(_.addHandler(handler))
    +    serverInfo.foreach { sInfo =>
    --- End diff --
    
    I'm still working on it since it touches a bunch of other things, not just 
this. This is fine as is, it's better to have a more targeted fix here and 
leave my PR just as refactoring.


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