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

    https://github.com/apache/spark/pull/1980#discussion_r18532610
  
    --- Diff: core/src/main/scala/org/apache/spark/ui/JettyUtils.scala ---
    @@ -205,10 +231,74 @@ private[spark] object JettyUtils extends Logging {
         ServerInfo(server, boundPort, collection)
       }
     
    +  // to generate a new url string scheme://server:port+path
    --- End diff --
    
    Hi @scwf,
    
    The reason I asked for a comment is that it seems like the method is doing 
a little more than just that. For example, L238 seems to be doing some sort of 
parsing of the `server` string, so it's more than just concatenating the 
different arguments into a URL.
    
    It would be nice if the comment explained exactly what the relationship 
between the input and the output is. A unit test wouldn't hurt either.


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