Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/19419#discussion_r144483070
--- Diff: core/src/main/scala/org/apache/spark/ui/JettyUtils.scala ---
@@ -89,6 +90,14 @@ private[spark] object JettyUtils extends Logging {
val result = servletParams.responder(request)
response.setHeader("Cache-Control", "no-cache, no-store,
must-revalidate")
response.setHeader("X-Frame-Options", xFrameOptionsValue)
+
conf.get(UI_X_XSS_PROTECTION).foreach(response.setHeader("X-XSS-Protection", _))
+ if (conf.get(UI_X_CONTENT_TYPE_OPTIONS.key).equals("true")) {
--- End diff --
At the moment this would fail if unset
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