Github user gurvindersingh commented on the issue:

    https://github.com/apache/spark/pull/13950
  
    OK, I have added docs about using this with caution, as it will disable 
direct application UI access. Regarding redirecting automatically to master, I 
faced issue as during application UI I couldn't access masterwebuiUrl and 
applicationId, otherwise I could simply added the redirect as
    
    ```
    if (reverseProxy) {
      attachHandler(createRedirectHandler("/", 
s"${masterwebuiUrl}/proxy/${appId}/jobs", basePath = basePath))
    } else {
      attachHandler(createRedirectHandler("/", "/jobs/", basePath = basePath))
    }
    ```
    
    In any case, user now clearly sees in the documentation as when reverse 
proxy is enabled use master public URL to access all the UIs.


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