Github user JoshRosen commented on the pull request: https://github.com/apache/spark/pull/1980#issuecomment-55662724 Is `spark.http.policy` the best name for this configuration option? Do you think that this can be a boolean option, or are there cases for wanting to have values other than `http` and `https`? It looks like [Hadoop has a `dfs.http.policy`](http://hadoop.apache.org/docs/r2.3.0/hadoop-project-dist/hadoop-hdfs/hdfs-default.xml) option that accepts three values, HTTP_ONLY, HTTPS_ONLY, and HTTP_AND_HTTPS. Whatever configuration options we end up using, we should add documentation for them to the [Spark Security](http://spark.apache.org/docs/latest/security.html) and [Configuration](http://spark.apache.org/docs/latest/configuration.html#spark-ui) guides.
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