sarutak commented on code in PR #53116:
URL: https://github.com/apache/spark/pull/53116#discussion_r2540704858


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core/src/test/scala/org/apache/spark/ui/UISuite.scala:
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@@ -234,7 +234,7 @@ class UISuite extends SparkFunSuite {
     val targetUri = URI.create(s"http://$localhost:4040";)
     when(clientRequest.getScheme()).thenReturn("http")
     when(clientRequest.getHeader("host")).thenReturn(s"$localhost:8080")
-    when(clientRequest.getPathInfo()).thenReturn("/proxy/worker-id/jobs")
+    when(clientRequest.getPathInfo()).thenReturn("/worker-id/jobs")

Review Comment:
   Good question. This change is relevant to [this 
part](https://github.com/apache/spark/pull/53116/files#diff-bb2ed90c22fe4b314488f3ffbd32e9998a9fd2dae994ea575b264d81f060cba7R433).
   
   `/proxy` is a [context 
root](https://github.com/apache/spark/blob/5fb072e4f25f471e69e2b81ee0155cc24a20725a/core/src/main/scala/org/apache/spark/ui/JettyUtils.scala#L235)
 so the returned value from `HttpServletRequest#getPathInfo` should not 
contains `/proxy`.  In old versions of Jetty, the returned value can strangely 
contain a context root.
   As of Jetty 12, Jetty specific `Core API` and the standard Servlet API are 
decoupled and `getPathInfo` doesn't return a path with a context root (`/proxy` 
in this case).



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