Major Description
The root of the history server is rendered dynamically with javascript, and this doesn't honor APPLICATION_WEB_PROXY_BASE: https://github.com/apache/spark/blob/master/core/src/main/resources/org/apache/spark/ui/static/historypage-template.html#L67
Other links in the history server do honor it: https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/ui/UIUtils.scala#L146
This means the links on the history server root page are broken when deployed behind a proxy.
