Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/19419#discussion_r143113850
--- Diff: conf/spark-defaults.conf.template ---
@@ -25,3 +25,10 @@
# spark.serializer
org.apache.spark.serializer.KryoSerializer
# spark.driver.memory 5g
# spark.executor.extraJavaOptions -XX:+PrintGCDetails -Dkey=value
-Dnumbers="one two three"
+
+#spark.ui.allowFramingFrom https://www.example.com/
+#spark.ui.xXssProtection 1; mode=block
+#spark.ui.xContentType.options nosniff
+
+#Enable below only when Spark is running on HTTPS
+#spark.ui.strictTransportSecurity max-age=31536000
--- End diff --
Could you add a space after `#` and an empty line at the end of file?
```
# spark.ui.allowFramingFrom https://www.example.com/
# spark.ui.xXssProtection 1; mode=block
# spark.ui.xContentType.options nosniff
# Enable below only when Spark is running on HTTPS
# spark.ui.strictTransportSecurity max-age=31536000
```
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