Github user vanzin commented on the issue: https://github.com/apache/spark/pull/13950 > Wondering if the test for location header is really needed Always a good idea to have tests, even if you feel the code is simple. Then if someone needs to change the code later, the tests might catch anything wrong. Also, it seems you implemented the proxyBase approach I suggested. Can you confirm that, when proxying is enabled, you can still look at the app's UI by going to the app's web server directly, and not just through the master UI? (In YARN you get redirected to the "master" - the YARN RM in that case - when going to the app's web server, but here you don't have any code to do that, so the UI should still work when setting proxyBase.)
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