Gurvinder created SPARK-15487:
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             Summary: Spark Master UI to reverse proxy Application and Workers 
UI
                 Key: SPARK-15487
                 URL: https://issues.apache.org/jira/browse/SPARK-15487
             Project: Spark
          Issue Type: Improvement
          Components: Web UI
    Affects Versions: 1.6.1, 1.6.0
            Reporter: Gurvinder
            Priority: Minor


Currently when running in Standalone mode, Spark UI's link to workers and 
application drivers are pointing to internal/protected network endpoints. So to 
access workers/application UI user's machine has to connect to VPN or need to 
have access to internal network directly.

Therefore the proposal is to make Spark master UI reverse proxy this 
information back to the user. So only Spark master UI needs to be opened up to 
internet. 

The minimal changes can be done by adding another route e.g. 
http://spark-master.com/target/<endpoint>/ so when request goes to target, 
ProxyServlet kicks in and takes the <endpoint> and forwards the request to it 
and send response back to user.



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